華府智庫移民政策研究所(Migration Policy Institute)調查發現，目前美國人口中有4400萬人在外國出生，相當於總人口的13.5%，創史上新高；其中22%的居民在家不說英語，而說西班牙語最普遍。

若以州別來看，五歲以上且在家不說英語者，內華達州的比率最高，為31%；其次是佛羅里達州的29%。

研究指出，「全美來看，在家不說英語者多說西班牙語，若以移民人口快速增加15州來看，則只有阿拉斯加例外，當地人說愛斯基摩-阿留申語(Eskimo-Aleut)和其他北美原住民語。」

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報告透露了移民定居的新趨勢，不再是聚集在特定州或城市，而是分散於全美。

舉例來說，雖然過去八年來移民人數增加9%，但15個州的外國出生人口至少增加15%；這種現象出現在北達科他、西維吉尼亞、南達科他、德拉瓦、內布拉斯加、明尼蘇達、懷俄明、阿拉斯加、印第安納、佛羅里達、內華達、愛荷華、馬里蘭，以及賓州和華盛頓州。

報告寫道，「約900萬名移民住在這15州，相當於每五人就有一人如此。」

移民以墨西哥裔和古巴裔為大宗，其次則來自印度和中國。

• The Migration Policy Institute discovered that 22 per cent of the US population prefers to speak another language at home
• 'Spanish was the top non-English language spoken at home in the country overall,' the study found 
•  The Washington, DC-based think tank also noted in their study that the number of foreign-born US citizens represents 13.5 per cent of the population 
• The data also suggests a trend showing immigrants dispersing across the country instead of gravitating to a few states and cities

Nearly a quarter of American households do not speak English as their first language, a new study published on Tuesday has found.  

The Migration Policy Institute discovered that 22 per cent of the US population prefers to speak another language at home, with the highest concentrations located in Nevada and Florida.    

'Spanish was the top non-English language spoken at home in the country overall and in the 15 fastest-growing states with one exception: Alaska, where Eskimo–Aleut and other Native American languages predominated,' the report found.

The Washington, DC-based think tank also noted in their study that the number of foreign-born US citizens is at its highest level ever, with approximately 44 million immigrants calling America home.

The number translates into 13.5 per cent of the population.

The data also suggests a trend showing immigrants dispersing across the country instead of gravitating to a few states and cities.

And while the number of immigrants between 2010 and 2016 increased by nine per cent, the foreign-born population surged 15 percent or more in 15 states: North Dakota, West Virginia, South Dakota, Delaware, Nebraska, Minnesota, Wyoming, Pennsylvania, Alaska, Indiana, Florida, Nevada. 

'Approximately nine million immigrants, or one in every five, reside in these 15 states,' with Mexicans and Cubans dominating the influx followed by those from India and China, the MPI reported. 

North Dakota, West Virginia, and South Dakota were the states that experienced the fastest growth rates, with 48 per cent, 41 per cent, and 39 per cent, respectively.

The MPI said that 1.6 million foreign nationals in the top 15 states were able to obtain legal status via a green card between 2010 and 2016, which accounted for 22 percent of the 7.4 million immigrants who received green cards during the same period nationwide. 

US estimates for illegal immigration hovers around 11 million, with about 1.7 million undocumented foreign nationals living in the 15 states examined in the study.   

The report also notes that in 2014, 'about 84.2 babies were born per 1,000 immigrant women ages 15 to 44, compared to 58.3 births per 1,000 U.S.-born women in 2014, according to Pew Research Center estimates.'  

Other noteworthy trends the data delineated was that immigrants are highly represented among all workers in low-skilled job (especially in Florida and Nevada) and are likely to lack basic health insurance.