Immigration by the Numbers: What the Data Actually Shows

Few topics in American politics generate more heat and less light than immigration. You have probably heard someone say "we're being invaded" and someone else say "immigrants are a net positive for the economy." Both statements contain elements of truth and elements of distortion. The data on immigration is genuinely complicated, sometimes incomplete, and almost always presented selectively.

This post is not going to tell you what to think about immigration policy. It is going to lay out the most current, authoritative data available on the scale of unauthorized immigration, what we know about crime, and what the economic research shows. Every major claim is sourced. Where the data is incomplete or contested, we say so.

The goal is to give you a foundation for evaluating the claims you hear, not to make the argument for you.

How Many Unauthorized Immigrants Are in the U.S.?

The most widely cited estimate comes from the Pew Research Center and the Department of Homeland Security: roughly 11 million unauthorized immigrants lived in the United States as of 2022. That number was remarkably stable from about 2010 to 2019, fluctuating between 10.5 and 11.5 million. It actually declined from a peak of about 12.2 million in 2007, largely because unauthorized immigration from Mexico dropped significantly during and after the Great Recession.

That "11 million" figure has become a political football. Some argue the real number is much higher given the 2021-2023 border surge. Others point out that encounters are not the same as people who successfully entered and stayed. The honest answer: nobody has a precise count. These are estimates based on Census Bureau surveys and demographic modeling. The actual number could be somewhat higher or lower.

The Congressional Budget Office estimated that net immigration was significantly higher than historical norms during 2021-2023. The unauthorized population almost certainly grew during that period, but translating encounter numbers into a population count is difficult when you are tracking people who, by definition, are not in government databases.

Border Encounters: The Numbers Behind the Headlines

Border encounter data from U.S. Customs and Border Protection is the most frequently cited statistic in immigration debates. Here is the trend at the southwest border:

FY2020: ~400,000 encounters
FY2021: ~1.7 million encounters
FY2022: ~2.4 million encounters
FY2023: ~2.5 million encounters (the highest on record)
FY2024: Encounters declined significantly, particularly after June 2024
FY2025 (partial): Encounters continued declining, reaching levels well below FY2021

Those numbers are real, and the surge from FY2021 to FY2023 was historically unprecedented. That is not spin. It happened.

But there are critical nuances that almost never make it into the headlines.

Encounters are not entries. An encounter means CBP apprehended or encountered someone at or near the border. Many of those people were expelled under Title 42 (a COVID-era public health order used through May 2023) without being admitted into the country. Others were detained and placed in removal proceedings. The encounter number tells you about demand at the border. It does not tell you how many people successfully entered and remained in the United States.

The same person can be counted multiple times. If someone is apprehended, expelled, and tries again, each attempt counts as a separate encounter. CBP has estimated that recidivism (repeat crossers) accounts for a meaningful share of total encounters, though exact figures vary. During the Title 42 period, when people were quickly expelled without legal consequences, recidivism was particularly high because there was little deterrent against trying again.

The decline in FY2024-2025 is also real. Encounters dropped substantially starting mid-2024, driven by executive action on asylum restrictions, increased enforcement by Mexico, and shifting migration patterns. By early 2025, encounters were at multi-year lows.

The Fact Most People Do Not Know: Visa Overstays

Here is a statistic that rarely gets the attention it deserves. According to the Center for Migration Studies and corroborated by DHS data, roughly 40-50% of unauthorized immigrants in the United States did not cross the border illegally. They entered the country legally on a valid visa, a tourist visa, student visa, or work visa, and then stayed after it expired.

The DHS Entry/Exit Overstay Report tracks visa overstays annually. In recent years, hundreds of thousands of people overstayed their visas each year. These are people who came through airports and legal ports of entry, passed background checks, and were admitted by immigration officers.

This matters because the policy conversation is overwhelmingly focused on the southern border. But if close to half of unauthorized immigrants entered through the front door with a valid visa, border-only solutions can only address part of the problem. Effective enforcement also requires tracking visa holders after they arrive and ensuring they leave when their authorization expires. The U.S. has been working on a comprehensive biometric entry/exit system for decades and still does not have a fully operational one.

Where Unauthorized Immigrants Come From

The composition of unauthorized immigration has shifted dramatically over the past two decades.

Historically, the majority of unauthorized immigrants were from Mexico. As recently as 2007, Mexicans made up about 57% of the unauthorized population, according to Pew Research Center data. That share has dropped significantly. Unauthorized immigration from Mexico has been declining since the late 2000s, driven by Mexico's improving economy, lower birth rates, and increased U.S. border enforcement.

The 2021-2023 surge was driven largely by Central Americans (Guatemala, Honduras, El Salvador), Venezuelans, Haitians, Cubans, Nicaraguans, and increasingly people from outside the Western Hemisphere, including China, India, and various African nations. This diversity has complicated enforcement because deportation agreements vary widely. Some countries accept deportees readily. Others, like Venezuela under Maduro, have been far less cooperative.

Where They Live

Unauthorized immigrants are not evenly distributed across the country. According to Pew Research Center estimates, the states with the largest unauthorized populations are:

California: ~1.8 million
Texas: ~1.6 million
Florida: ~900,000
New York: ~600,000
New Jersey: ~450,000
Illinois: ~400,000

These six states account for more than half of the total unauthorized population. This concentration means the costs and benefits of immigration are not experienced equally across the country. It also helps explain why the political debate often breaks down along geographic lines, though not as neatly as you might expect: some states with the largest unauthorized populations are politically conservative, and some of the loudest opposition comes from states with relatively few immigrants.

Crime: The Most Politically Charged Question

This is the section that requires the most care, because it is the most misrepresented on all sides.

What the Research Shows

Multiple peer-reviewed studies and data analyses have examined the relationship between immigration and crime. The findings are remarkably consistent.

The Cato Institute (a libertarian think tank, not a liberal one) published an analysis of Texas Department of Public Safety data covering 2012-2018. Texas is one of the few states that tracks the immigration status of arrested individuals. The findings: unauthorized immigrants were convicted of homicide at a rate 56% lower than native-born citizens, convicted of sexual assault at a rate 69% lower, and convicted of larceny at a rate 85% lower. Across nearly all crime categories, unauthorized immigrants had significantly lower conviction rates than native-born Americans.

A study published in the Proceedings of the National Academy of Sciences (one of the most prestigious scientific journals in the world) examined data from 1990 to 2014 and found that increases in unauthorized immigration did not increase violent crime rates. In many cases, communities with growing immigrant populations saw crime rates decline.

The Marshall Project analyzed FBI data and found that between 2007 and 2016, crime fell faster in U.S. metropolitan areas that had more immigration than in those with less.

A 2024 study from the National Bureau of Economic Research examined the recent immigration surge specifically and found no evidence that it led to increased crime rates in the communities where migrants settled.

The Legitimate Policy Concern

Here is where the "but" comes in, and it is a real one.

The fact that unauthorized immigrants commit crimes at lower rates than native-born citizens does not mean they commit zero crimes. They do not. Any crime committed by someone who entered the country illegally or overstayed a visa raises a straightforward question: would this crime have happened if that person had not been in the country? The answer is no. For the victims of those crimes, the population-level statistics are cold comfort.

This is a legitimate policy argument. You can simultaneously accept that immigrants commit crimes at lower rates than native-born citizens AND believe that the government has an obligation to prevent crimes that would not have occurred if immigration laws had been enforced. These two positions are not contradictory. The debate is about scale, tradeoffs, and how much weight to give each consideration.

The "Migrant Crime Wave" Framing

Despite what you may have heard, there is no evidence of a "migrant crime wave" in national data. FBI Uniform Crime Report data shows that violent crime nationally declined in both 2023 and 2024, during and after the period of highest border encounters. Cities with large immigrant populations, including New York, Chicago, and Los Angeles, did not see crime spikes that correlated with immigration surges. Some saw crime decline.

Individual high-profile cases are real and tragic. These cases are not fabricated. But extrapolating from individual cases to a national trend is a statistical error that cuts both ways. You could just as easily pick individual horrific crimes by native-born Americans and use them to characterize all native-born citizens.

The Data Gaps

Here is what makes this debate so frustrating: the data is genuinely incomplete.

The United States does not have a comprehensive national database that tracks crimes by the immigration status of the offender. Most local police departments do not record or report immigration status. The Texas DPS data that the Cato Institute analyzed is the exception, not the rule.

Federal data from ICE and the Bureau of Justice Statistics covers federal prisons and immigration enforcement, but federal prisons dramatically overrepresent immigration-related offenses (illegal entry and reentry are federal crimes). Using federal prison data to draw conclusions about overall immigrant criminality is misleading.

Both sides exploit these gaps. Critics point to ICE arrest data showing thousands of noncitizens with criminal records. Supporters point to peer-reviewed studies showing lower crime rates. Both sets of data are real. Neither tells the complete story. If the U.S. had a comprehensive nationwide system for tracking crimes by immigration status, we could settle this with data. We do not, and building one raises its own civil liberties concerns.

Economic Impact: Costs and Benefits

Taxes Paid

Unauthorized immigrants pay taxes. This surprises many people, but the mechanisms are straightforward.

The Institute on Taxation and Economic Policy (ITEP) estimated that unauthorized immigrants paid approximately $96.7 billion in federal, state, and local taxes in 2022. Updated estimates for subsequent years push the figure above $100 billion.

How? Several ways:

Payroll taxes. Many unauthorized immigrants work using Individual Taxpayer Identification Numbers (ITINs) or mismatched Social Security numbers. Their employers withhold federal income tax, Social Security tax, and Medicare tax from their paychecks, just like any other worker. The Social Security Administration has acknowledged that unauthorized immigrants contribute billions annually to the Social Security trust fund through payroll taxes they will never be able to collect benefits from. The SSA's Earnings Suspense File, where wages reported with non-matching Social Security numbers are held, contains hundreds of billions of dollars in accumulated contributions.
Sales taxes. Everyone who buys things pays sales tax, regardless of immigration status.
Property taxes. Unauthorized immigrants who own homes pay property taxes directly. Renters pay them indirectly, since landlords build property taxes into rent.
Income tax returns. The IRS issues ITINs so that people without Social Security numbers can file tax returns. Millions of returns are filed using ITINs each year.

Benefits Received

Unauthorized immigrants are not eligible for most federal benefit programs. This is established law, not a matter of debate.

They cannot receive Social Security retirement or disability benefits. They cannot enroll in Medicare (except emergency care under EMTALA). They are not eligible for SNAP (food stamps), Medicaid (with limited exceptions for emergency treatment and in some states for pregnant women), Supplemental Security Income, or Temporary Assistance for Needy Families.

Some states have created state-funded programs that extend benefits to unauthorized immigrants, including driver's licenses, in-state college tuition, and state-funded health coverage. California, New York, Illinois, and others have expanded state-funded Medicaid-equivalent programs. These are state policy decisions funded by state tax revenue, not federal programs.

Labor Market

Unauthorized immigrants make up approximately 4-5% of the U.S. workforce, or roughly 8 million workers. They are concentrated in specific industries:

Agriculture: About 40-50% of farmworkers are unauthorized, according to the Department of Labor's National Agricultural Workers Survey. In some crops and regions, the share is significantly higher.
Construction: Unauthorized immigrants make up a substantial share of the construction workforce, particularly in residential building, roofing, and masonry.
Food processing: Meatpacking plants, food processing facilities, and related industries rely heavily on immigrant labor.
Hospitality: Hotels, restaurants, and food service employ large numbers of unauthorized workers.
Domestic services: Housekeeping, landscaping, and childcare.

If unauthorized workers were removed from these industries overnight, the effects on food prices, housing construction timelines, and service availability would be immediate. The American Farm Bureau Federation and the U.S. Chamber of Commerce, neither of which are liberal organizations, have consistently argued that the economy depends on immigrant labor in these sectors.

The CBO's Economic Projection

In January 2024, the Congressional Budget Office published an analysis of the economic effects of the recent immigration surge. CBO is Congress's nonpartisan budget scorekeeper. Their estimate: the surge in immigration (both authorized and unauthorized) would add approximately $7 trillion to U.S. GDP over the 2024-2034 period and increase federal revenues by about $1 trillion over the same period.

The reasoning: more workers means more economic output, more consumer spending, and more tax revenue. This projection comes with caveats. It assumes immigrants integrate into the labor force at historical rates, captures aggregate effects rather than distributional ones, and measures GDP growth, not whether individual native-born workers are better or worse off.

The Costs

The benefits do not come without costs, and the costs fall disproportionately on state and local governments.

Education. Under the Supreme Court's 1982 decision in Plyler v. Doe, public schools must educate all children regardless of immigration status. This is settled constitutional law. School districts in areas with large immigrant populations bear real costs for additional students, including those who need English language instruction. These costs are borne by state and local taxpayers, not the federal government.

Emergency healthcare. Under EMTALA (the Emergency Medical Treatment and Labor Act), hospitals must provide emergency care regardless of a patient's ability to pay or immigration status. Hospitals in border states and areas with large immigrant populations absorb significant uncompensated care costs. Some of this is offset by federal Disproportionate Share Hospital payments, but not all.

Law enforcement. Local police departments and county jails bear costs related to immigrants who commit crimes, including detention, prosecution, and incarceration. Federal reimbursement through programs like the State Criminal Alien Assistance Program exists but does not fully cover these costs.

Net Fiscal Impact: It Depends on Where You Look

The net fiscal impact of unauthorized immigration is debated among economists, but there is a rough consensus on the pattern.

At the federal level, the impact is likely positive or neutral. Unauthorized immigrants pay payroll taxes and income taxes but are ineligible for most federal benefits. The Social Security Administration receives billions in contributions it will never pay out in benefits. Federal tax revenue goes up while federal benefit spending is mostly unchanged.

At the state and local level, the impact is likely negative in the short term. Education and emergency healthcare are expensive, and these costs fall on state and local budgets. Over time, as immigrant families establish themselves and their children enter the workforce, the fiscal picture improves, but that does not help the school district that needs to hire more teachers right now.

This mismatch, where the federal government captures revenue while state and local governments bear costs, is one of the central tensions in the immigration debate. It helps explain why some local officials are frustrated even when national-level economic data looks positive.

What Both Sides Get Right, and What They Get Wrong

Rather than "debunking" either side, here is a straightforward assessment of common claims measured against the best available data.

"The border is out of control"

What the data shows: Border encounters reached historically unprecedented levels from FY2021 to FY2023. The system was overwhelmed, processing times ballooned, and many migrants were released with court dates years in the future. The operational strain was real.

What the data also shows: Encounters declined significantly in FY2024-2025. The situation is not static. "Encounters" is not the same as "entries." The "invasion" framing overstates the security threat based on available crime data and mischaracterizes what is largely economic migration and asylum-seeking.

"They're all criminals"

What the data shows: This is contradicted by every major study on the topic. Unauthorized immigrants commit crimes at lower rates than native-born Americans. Cities with large immigrant populations are not more dangerous on average.

What the data also shows: Some unauthorized immigrants do commit serious crimes, and those crimes would not have occurred if those individuals had not been in the country. Dismissing this concern as irrelevant is not honest.

"They pay their way and contribute more than they take"

What the data shows: At the federal level, this is largely true. Unauthorized immigrants are net contributors to Social Security and Medicare, pay billions in taxes, and receive few federal benefits.

What the data also shows: This framing understates the costs borne by specific communities. School districts, hospitals, and local governments in high-immigration areas face real fiscal pressure. Telling a local taxpayer whose property taxes went up that "immigrants are a net positive nationally" does not address their experience.

"There are 11 million unauthorized immigrants"

What the data shows: That estimate was reasonable through about 2020. Given the 2021-2023 border surge, the actual number is likely higher. Some researchers suggest 12-14 million, though no one has a precise count.

What the data also shows: Claims of 20, 30, or 40 million have no basis in demographic evidence. The Census Bureau's American Community Survey does not support figures anywhere near those levels.

The Data We Do Not Have

One of the most important things to acknowledge in this debate is what we simply do not know.

We do not have a reliable count of the unauthorized population in real time. We do not have a comprehensive national database of crimes committed by immigration status. We do not have good data on how many people who were released at the border actually showed up for their immigration court dates (the data that exists suggests most do, but tracking is incomplete). We do not have a working biometric entry/exit system to track visa overstays in real time.

These gaps reflect decades of underinvestment in immigration infrastructure, political disagreements about what data should even be collected, and genuine civil liberties concerns about tracking people by national origin. The result is that both sides are often arguing from incomplete information, filling in the gaps with assumptions that fit their preferred narrative. When someone presents immigration data with absolute certainty and no caveats, that is a sign they are selling you something.

Following This Debate

Immigration policy is shaped by executive orders (which can change with each administration), legislation that must pass through the full congressional process (which has failed repeatedly for decades), and court decisions that can block either. Your representatives handle immigration-related casework more than almost any other topic.

When you hear claims about immigration, ask three questions:

What is the source? Peer-reviewed research, government data, and nonpartisan analysis are more reliable than advocacy organizations on either side or social media posts. Even reliable sources have limitations, so check what they are actually measuring.
Is this a rate or a raw number? Raw numbers sound alarming but can be misleading without context. "Ten thousand immigrants were arrested" tells you nothing without knowing it as a rate compared to the total population. Population-level statistics can obscure individual cases that matter.
Who bears the costs and who gets the benefits? National-level data can show a positive economic impact while specific communities bear concentrated costs. Both things can be true at the same time.

Immigration is a policy area where the gap between the data and the debate is unusually wide. The numbers are available. They just rarely make it into the conversation intact.