There is always a lot of talk about where illegal immigrants are in largest numbers. I think it will be interesting to put numbers to it. Enjoy!
Illegal Immigrant population by County as of 2013. All counties with over 50,000 Undocumented Immigrants listed:
Los Angeles County, CA: 1,062,000
Harris County, TX (Houston): 373,000
Cook County, IL (Chicago): 323,000
Orange County, CA (Santa Ana): 274,000
Dallas County, TX (Dallas): 242,000
San Diego County, CA (San Diego): 205,000
Maricopa County, AZ (Phoenix): 190,000
Kings County, NY (Brooklyn): 181,000
Riverside County, CA (Riverside): 158,000
Miami-Dade County, FL (Miami): 156,000
Santa Clara County, CA (San Jose): 142,000
San Bernardino, CA (San Bernardino): 138,000
Bronx County, NY (The Bronx): 114,000
Clark County, NV (Las Vegas): 113,000
Tarrant County, TX (Fort Worth): 109,000
Alameda County, CA (Oakland): 108,000
Hidalgo County, TX (McAllen): 94,000
Fresno County, TX (Fresno): 86,000
Broward County, FL (Fort Lauderdale): 83,000
Fairfax County, VA (Fairfax): 83,000
Montgomery County, MD (Rockville): 83,000
Gwinnett County, GA (Lawrenceville): 80,000
Travis County, TX (Austin): 79,000
Hudson County, NJ (Jersey City): 77,000
Kern County, CA (Bakersfield): 75,000
King County, WA (Seattle): 75,000
Price Georges County, MD (Upper Marlboro): 69,000
Bexar County, TX (San Antonio): 68,000
Sacramento County, CA (Sacramento): 66,000
Contra Costa County, CA (Martinez): 66,000
Monterrey County, CA (Monterrey): 63,000
Palm Beach County, FL (West Palm Beach): 65,000
Middlesex County, NJ (New Brunswick): 63,000
Bergen County, NJ (Hackensack): 58,000
Essex County, NJ (Newark): 57,000
San Mateo County, CA (Redwood City): 57,000
Mecklenburg County, NC (Charlotte): 57,000
El Paso County, TX (El Paso): 56,000
San Joaquin County, CA (Stockton): 52,000
DeKalb County, GA (Decatur): 51,000
Tulare County, CA (Visalia): 50,000
The largest by state are below. All over 100,000 are listed:
California: 3,034,000
Texas: 1,464,000
New York: 867,000
Florida: 605,000
Illinois: 519,000
New Jersey: 509,000
Georgia: 393,000
North Carolina: 342,000
Arizona: 264,000
Virginia: 247,000
Maryland: 233,000
Washington: 204,000
Massachusetts: 185,000
Colorado: 164,000
Nevada: 138,000
Pennsylvania: 136,000
Tennessee: 119,000
Oregon: 115,000
Connecticut: 108,000
Unauthorized Immigrant Populations by Country and Region, Top State and County Destinations, 2009-13 | migrationpolicy.org