Where immigrants to the US come from, 1850 to today

The United States is the top destination in the world for people moving from one country to another. Over 70 million immigrants have arrived in the U.S. since 1965, according to a Pew Research Center analysis of Census Bureau data. About 18 million have come from Mexico, making up the largest wave of immigration from a single country to the U.S.

In 2022, the number of immigrants living in the U.S. reached a high of 46.1 million, accounting for 13.8% of the population. (This includes both legal and unauthorized immigrants.)

These immigrants trace their roots to virtually all countries around the world. The largest numbers hail from Mexico (10.6 million) and India (2.8 million). That’s different from a century ago: In 1920, the largest immigrant populations were from Germany and Italy.

How we did this

Pew Research Center conducted this analysis to explore how immigration patterns have changed throughout the United States and by state over time.

The maps and data in this analysis are based on Center tabulations of Census Bureau microdata from IPUMS USA. The maps show the largest country of birth for immigrants in each state or territory from 1850 to 2022. The tabulations agree as closely as possible with published Census Bureau data on the national and state foreign-born populations and other national data on the country of birth of immigrants.

Data: For the 1850-1880 and 1900-1940 censuses, the tabulations use complete count census data, which has one record for each person counted in the census. The census data comes from 1% samples for 1950 and 1970 (form 1 for 1970). For the 1960 and 1980-2000 censuses, it comes from 5% samples. For 2010 and 2022, we use the 1% sample from the American Community Survey (ACS).

States and territories: Before 1960, some censuses included data for territories that would later become states. When available, we show data for these areas and designate the territorial status in the maps with an asterisk (*). Prior to 1959, Alaska and Hawaii were not routinely represented in IPUMS datasets used in this analysis. However, IPUMS samples that include these two areas in 1900-1920 (1% samples) and 1930 (5% sample) provide data for the maps.

Immigrant population: The immigrant or foreign-born population consists of people born outside the United States or its territories who are not U.S. citizens at birth. In census data for 1970-2000 and ACS data for 2010-2022, there is a direct question on U.S. citizenship that defines the foreign-born population.

For the earlier censuses, we used several steps to define the immigrant and U.S.-born or native populations. First, people born in U.S. territories and outlying areas are considered part of the native population.

The territories defined as part of the native population are: Alaska (1870 and later); Hawaii, Puerto Rico, Guam and American Samoa (1900 and later); Philippines (1900-1940); Panama Canal Zone (1900-1970); U.S. Virgin Islands (1920 and later); Trust Territory of the Pacific (1950-1980); and Northern Mariana Islands (1950 and later).

Beginning with the 1890 census, people born outside the U.S. and its territories were considered U.S. citizens at birth if they had one or two American-born parents under certain conditions. The criteria have changed over time and do not appear to have been consistently applied in the early censuses. The IPUMS data has coded some of these cases directly. For other cases, we use the country of birth of each respondent’s mother and father (either as reported in the census or assigned by IPUMS) to determine whether the individual is foreign born.

Country of birth: Countries of birth in the tabulations generally reflect the countries and regions within countries (e.g., Alsace-Lorraine, Bavaria) recognized at the time the data was collected. This reflects the responses to the census and generally agrees with official publications from the censuses. The country boundaries are similar to modern ones but may differ slightly in some cases.

The groupings used for the countries in the census and ACS data are:

United Kingdom: England, Scotland, Wales and Channel Islands in all years; Northern Ireland in 1930 and later.
Germany: Various German states, East Germany and West Germany in all years; Alsace and Lorraine for 1870-1910.
Austria: Austria and regions defined as Austria, including Austria-Hungary.
Poland: Regions defined as Poland, Austrian Poland, German Poland, Russian Poland, Prussian Poland, Galicia, Pomerania, West Prussia and various other areas.
Russia (1850-1920), USSR (1930-1990), USSR (former): These designations basically refer to the same area. It includes Russia plus the republics within the Soviet Union (e.g., Estonia, Belarus, Ukraine, Kazakhstan, Siberia). The exception is Armenia, which is treated as a separate country for 1920-1930.
China: Mongolia and Taiwan for 1850-1940; Hong Kong and Macau for 2000-2022.
Portugal: Azores, Madeira Islands and St. Miguel in all years; Cape Verde Islands through 1970.
Korea: North and South Korea.

Various other countries and regions are grouped together, but none are the top origin countries for states or in the top five origin countries nationally.

Immigrant populations by state

The share of immigrants varies widely among states, from 2% in West Virginia to 27% in California. In 2022, Mexican immigrants were the largest group in 29 states, while Indian immigrants were the largest group in six states.

Mirroring the national trend, the origins of immigrants living in each state have changed dramatically in the past century. In 1920, the largest immigrant groups in 29 states were born in Germany, Italy or Canada. And only six states had the same largest origin group in 2022 that they did in 1920: Arizona, New Mexico and Texas (all from Mexico) and Maine, Montana and Vermont (from Canada).

Maps showing where each U.S. state’s largest immigrant population was born in 1920 and 2022.

Why has the immigrant population changed over the years?

Reasons behind the changes in the U.S. immigrant population since 1965 include:

A more equitable U.S. immigration law. The 1965 Immigration and Nationality Act opened up legal immigration from Asia and Latin America. The law it replaced had favored immigrants from Northern and Western Europe and mostly barred those from Asia.
Unauthorized immigration. Unauthorized immigration to the U.S. began to grow in the 1970s, which made the total number of immigrants go up. Most of those who came before 1982 acquired legal status after the passage of the 1986 Immigration Reform and Control Act. However, unauthorized immigrants continued to come in large numbers.
Further changes in U.S. immigration law. A revision to the 1965 act in 1990 allowed more legal immigrants to enter the U.S. and provided alternative ways for people to immigrate, increasing the diversity of origins.

An area chart showing the immigrant share of the U.S. population from 1850 to 2022.

Where immigrants have settled in the U.S. over time

1840-1889

The first large wave of immigration to the U.S. began in the 1840s and lasted until 1889. During this time, more than 14 million immigrants came to the country. Most arrived from Northern or Western Europe; Germany, Ireland and the United Kingdom alone accounted for 70% of the new arrivals.

How America’s source of immigrants has changed over time

Top country of birth among U.S. immigrants, by state

1850