How many undocumented workers are there in the united states

Estimating the number of undocumented workers in the United States is a complex and sensitive task, with figures varying across sources and methodologies.

While precise numbers are difficult to determine, most estimates suggest there are between 10 and 11 million unauthorized immigrants living in the country, a significant portion of whom are part of the workforce. These individuals contribute to key sectors such as agriculture, construction, hospitality, and service industries.

Despite their economic contributions, undocumented workers often operate in the shadows, facing challenges related to legal protections, wages, and working conditions. Understanding their presence and impact is essential for informed policy discussions on immigration and labor reform.

How many undocumented workers

How Many Undocumented Workers Are There in the United States?

Estimating the number of undocumented workers in the United States is a complex task due to the hidden nature of this population and the lack of official documentation. However, various research organizations, government agencies, and academic institutions rely on demographic data, census surveys, immigration records, and statistical modeling to produce reliable approximations.

According to the Pew Research Center, which is one of the most widely cited sources on this topic, there were approximately 10.5 million unauthorized immigrants living in the U.S. in 2017, with the majority being part of the labor force.

More recent estimates from the same source suggest the number has remained relatively stable, with slight fluctuations over the past decade. These individuals are not evenly distributed across the country or economy: they are concentrated in specific states—such as California, Texas, Florida, and New York—and in sectors like agriculture, construction, hospitality, and food services.

While precise figures are difficult to obtain, federal agencies such as the Department of Homeland Security (DHS) and the U.S. Census Bureau contribute data through surveys and estimation models that help refine the overall picture. It's important to note that “undocumented worker” refers to foreign-born individuals who either entered the country without inspection or overstayed their visas and are currently employed, either formally or informally.

How many undocumented workers are there

Estimates and Data Sources on Undocumented Workers

Estimating the number of undocumented workers involves combining data from multiple authoritative sources. The Pew Research Center uses a residual method—subtracting the number of legally present foreign-born individuals from the total foreign-born population in U.S.

Census data—to arrive at an estimate of unauthorized immigrants. Other key data sources include the American Community Survey (ACS) and the Current Population Survey (CPS), both conducted jointly by the U.S. Census Bureau and the Bureau of Labor Statistics. The Department of Homeland Security (DHS) also publishes its own estimates using similar residual techniques.

While these organizations may report slightly different figures due to variations in methodology and data years, they generally agree on a range between 10 to 11 million undocumented immigrants in the U.S. during the late 2010s and early 2020s. Although estimates have not drastically increased in recent years, shifts in migration patterns, border enforcement, and visa overstays continue to influence the population size.

Geographic and Sector Distribution of Undocumented Workers

Undocumented workers are not uniformly distributed across the United States; instead, they are heavily concentrated in certain regions and industries.

How many undocumented workers in agriculture

States like California, Texas, Florida, and New York host over half of the total undocumented population, driven by economic opportunities, established immigrant communities, and demand for labor in key sectors. Within the economy, undocumented workers are disproportionately employed in low-wage, labor-intensive industries.

For example, in agriculture, they make up an estimated 50% to 70% of the workforce. In construction, the figure is around 15% to 20%, and in food services and landscaping, their presence is similarly significant.

These roles often involve physically demanding tasks and may lack job security or access to benefits. While some undocumented workers operate within the formal economy with jobs that report taxes, many are employed in the informal or underground economy, where employers may not comply with labor laws, increasing vulnerability to exploitation.

Trends and Changes in the Undocumented Workforce Over Time

The size and composition of the undocumented workforce in the United States have undergone notable shifts since the early 2000s. The population peaked around 2007 at approximately 12.2 million, according to Pew Research, but declined following the Great Recession and increased immigration enforcement. Since then, the number has stabilized at around 10.5 million.

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One significant trend is the change in country of origin: Mexico, once the dominant source, now accounts for a declining share, while immigration from Central America, Asia, and South America has increased. Another key factor is the growing number of visa overstays, which now outnumber unauthorized border crossings as the primary source of unauthorized status.

Additionally, many undocumented workers have lived in the U.S. for over a decade and have deep community and family ties. Long-term trends indicate a workforce that is aging, more dispersed geographically, and increasingly integrated into essential sectors of the U.S. economy.

Estimates and Challenges in Counting Undocumented Workers in the U.S.

Accurate data on the number of undocumented workers in the United States remains elusive due to the hidden nature of this population and limitations in data collection methods.

Federal agencies like the Department of Homeland Security (DHS) and the Pew Research Center rely on statistical models, census data, and immigration records to estimate that between 10.5 and 11 million undocumented immigrants live in the country, with a significant share actively participating in the labor force—approximately 7 million according to recent estimates.

These workers are often undercounted because they avoid government surveys due to fear of deportation or lack of access to official channels. Many reside in sectors with high cash-based transactions such as construction, agriculture, hospitality, and domestic services, making it even harder to track their employment status accurately.

Discrepancies between various estimation methods—like residual population analysis—highlight the complexity of producing definitive figures while underscoring the critical role these individuals play in the U.S. economy.

Major Sources of Data on Undocumented Workers

The most reliable estimates on undocumented workers stem from organizations like the Pew Research Center, the Center for Migration Studies (CMS), and the U.S. Department of Homeland Security. These entities use a method known as the residual estimation technique, which subtracts the legally resident foreign-born population—derived from census and survey data—from the total foreign-born population to approximate the undocumented count. While U.S. Census Bureau data provides foundational statistics, it may underrepresent undocumented individuals due to non-response or exclusion. Additionally, the American Community Survey (ACS) and Current Population Survey (CPS) are frequently analyzed to infer immigration status based on country of origin, year of entry, and legal status indicators. Despite these efforts, discrepancies between sources can result in differing estimates due to variations in assumptions and data granularity.

Geographic Distribution of Undocumented Workers

Undocumented workers are not evenly distributed across the United States but are concentrated in certain states and metropolitan areas. California, Texas, Florida, New York, and Illinois collectively account for nearly half of the nation’s undocumented population.

These states offer diverse job opportunities in sectors that often hire undocumented labor, as well as established immigrant communities that provide social and economic support networks. Major urban centers like Los Angeles, Houston, New York City, and Miami are significant hubs due to their large informal economies and high demand for service-based labor.

Rural areas in states such as North Carolina and Georgia have also seen increases in undocumented populations, particularly within the agricultural and poultry industries. This regional clustering affects local labor markets, public services, and immigration enforcement priorities.

Key Industries Employing Undocumented Workers

Undocumented workers are heavily represented in industries that rely on low-wage, labor-intensive jobs often avoided by native-born workers. The agriculture sector employs a substantial portion, with estimates suggesting that up to one-third of farmworkers are undocumented.

Equally significant is their presence in construction, where almost 15% of all workers may lack legal status, especially in renovation and residential building. The service industry, including landscaping, janitorial services, and food preparation, also depends on undocumented labor.

In addition, many work in meatpacking plants, hospitality, and domestic work, often paid in cash and with limited labor protections. These industries benefit from lower labor costs, but this reliance raises ethical concerns regarding worker exploitation, wage theft, and workplace safety.

Methodological Challenges in Estimating Numbers

Estimating the exact number of undocumented workers involves significant statistical uncertainty due to the absence of direct counts and the inherent invisibility of this population.

The residual method, while widely used, depends on accurate counts of legal immigrants and assumptions about emigration and mortality that may not hold over time.

Factors such as changing migration patterns, enforcement policies, and data underreporting can skew results. For instance, the 2020 Census saw lower participation rates in immigrant communities, likely due to fears surrounding the citizenship question, leading to potential undercounts.

Surveys often fail to capture recent arrivals or those living in mixed-status households. Additionally, no centralized employment database tracks immigration status, making it difficult to correlate employment figures with legal residency, further complicating accurate assessments.

Impact of Undocumented Workers on the U.S. Economy

Undocumented workers contribute substantially to the U.S. economy, paying billions in taxes—including sales, property, and payroll taxes—despite being ineligible for most public benefits.

The Institute on Taxation and Economic Policy (ITEP) estimates that undocumented immigrants contribute over $12 billion annually in state and local taxes.

They fill critical labor shortages in essential industries, supporting economic output and consumer affordability, particularly in food services, housing, and healthcare support roles. Their spending power stimulates local economies, and their labor allows many U.S. businesses to remain competitive.

Moreover, Social Security Administration (SSA) records show that undocumented workers generate surplus contributions to trust funds through withheld payroll taxes they are unlikely to claim. This economic integration underscores the complex reality that, while their status is unauthorized, their presence has measurable and often positive macroeconomic effects.

Frequently Asked Questions

How many undocumented workers are estimated to be in the United States?

Approximately 10.5 million undocumented immigrants live in the U.S., with about 7 million part of the workforce. These estimates come from the Pew Research Center and the U.S.

Department of Homeland Security, based on census data, surveys, and residency status analysis. Numbers fluctuate slightly year to year due to migration patterns, enforcement policies, and economic conditions, but the overall count has remained relatively stable over the past decade.

Which industries employ the most undocumented workers?

Undocumented workers are heavily represented in agriculture, construction, hospitality, and food services. These industries often rely on manual labor and may offer jobs with lower wages and fewer documentation requirements.

According to the Pew Research Center, about 20% work in construction, 15% in service roles, and 13% in farming. Their labor is crucial to maintaining operations in sectors facing labor shortages.

How do researchers estimate the number of undocumented workers?

Researchers estimate undocumented populations by analyzing data from the U.S. Census Bureau and American Community Survey, subtracting legally residing individuals from the total foreign-born population.

This method, called the residual estimation technique, uses legal immigration records, naturalizations, and emigration rates. Agencies like Pew and DHS apply this approach, adjusting for undercounts and data limitations to improve accuracy.

Has the number of undocumented workers changed significantly in recent years?

The number of undocumented workers has remained relatively stable over the past decade, hovering around 7 million in the workforce.

While there was a peak in the mid-2000s near 12 million, increased enforcement and economic factors contributed to a slight decline. Recent trends show modest growth due to visa overstays and new arrivals, but large-scale changes have not occurred.