| County | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| Los Angeles County [CA] | 349,899 | 4,653 | 209,232 | 3,613 |
| Queens County [NY] | 182,475 | 3,749 | 125,687 | 3,103 |
| Kings County [NY] | 164,625 | 2,617 | 117,759 | 2,495 |
| San Francisco County [CA] | 143,872 | 3,222 | 92,565 | 2,412 |
| Santa Clara County [CA] | 127,202 | 3,751 | 61,658 | 2,159 |
| Alameda County [CA] | 119,759 | 3,168 | 69,344 | 2,334 |
| New York County [NY] | 79,167 | 2,370 | 47,240 | 1,894 |
| Orange County [CA] | 65,820 | 2,724 | 30,344 | 1,784 |
| King County [WA] | 60,327 | 2,241 | 30,740 | 1,669 |
| Cook County [IL] | 57,563 | 1,989 | 31,858 | 1,385 |
| San Mateo County [CA] | 51,809 | 1,992 | 24,951 | 1,261 |
| Middlesex County [MA] | 41,269 | 1,884 | 19,706 | 1,319 |
| San Diego County [CA] | 41,138 | 2,162 | 20,296 | 1,294 |
| Harris County [TX] | 39,921 | 1,971 | 21,365 | 1,395 |
| Montgomery County [MD] | 34,986 | 1,456 | 15,946 | 1,057 |
| Sacramento County [CA] | 31,501 | 2,191 | 20,050 | 1,507 |
| Contra Costa County [CA] | 31,465 | 1,794 | 15,917 | 1,117 |
| Honolulu County [HI] | 29,933 | 1,628 | 19,142 | 1,175 |
| Philadelphia County [PA] | 26,342 | 1,629 | 17,851 | 1,311 |
| Norfolk County [MA] | 25,718 | 1,331 | 14,481 | 934 |
| Clark County [NV] | 24,346 | 1,639 | 14,543 | 1,161 |
| Middlesex County [NJ] | 23,038 | 1,532 | 10,940 | 950 |
| Fairfax County [VA] | 23,022 | 1,771 | 10,361 | 1,013 |
| San Bernardino County [CA] | 22,525 | 1,827 | 12,453 | 1,209 |
| Suffolk County [MA] | 22,345 | 1,112 | 13,817 | 902 |
| Maricopa County [AZ] | 20,337 | 1,440 | 10,163 | 905 |
| Nassau County [NY] | 19,641 | 1,212 | 10,311 | 850 |
| Fort Bend County [TX] | 19,433 | 1,583 | 8,614 | 893 |
| Collin County [TX] | 19,026 | 1,326 | 8,751 | 860 |
| Riverside County [CA] | 14,781 | 1,438 | 8,042 | 895 |
| Bergen County [NJ] | 13,189 | 1,342 | 5,944 | 825 |
| DuPage County [IL] | 12,119 | 876 | 5,672 | 687 |
| Dallas County [TX] | 11,694 | 1,213 | 6,046 | 804 |
| Morris County [NJ] | 11,066 | 960 | 5,038 | 641 |
| Suffolk County [NY] | 11,013 | 868 | 5,487 | 656 |
| Hudson County [NJ] | 10,989 | 1,068 | 4,922 | 629 |
| Richmond County [NY] | 10,675 | 831 | 5,952 | 635 |
| Gwinnett County [GA] | 10,656 | 1,213 | 6,028 | 990 |
| Travis County [TX] | 10,469 | 978 | 3,940 | 561 |
| Oakland County [MI] | 10,363 | 777 | 4,327 | 471 |
| Somerset County [NJ] | 9,963 | 1,070 | 3,795 | 531 |
| Multnomah County [OR] | 9,730 | 871 | 5,723 | 696 |
| Fulton County [GA] | 9,502 | 1,014 | 4,328 | 552 |
| Franklin County [OH] | 9,171 | 773 | 4,706 | 610 |
| Miami-Dade County [FL] | 8,878 | 1,187 | 4,776 | 819 |
| Cuyahoga County [OH] | 8,806 | 776 | 4,693 | 492 |
| Allegheny County [PA] | 8,708 | 706 | 4,195 | 549 |
| Washtenaw County [MI] | 8,632 | 667 | 3,374 | 531 |
| Westchester County [NY] | 8,625 | 1,035 | 2,983 | 481 |
| Montgomery County [PA] | 8,495 | 880 | 3,770 | 555 |
| Snohomish County [WA] | 8,279 | 901 | 4,573 | 598 |
| Wake County [NC] | 8,275 | 893 | 3,284 | 564 |
| Broward County [FL] | 8,159 | 1,039 | 4,506 | 583 |
| Hennepin County [MN] | 8,081 | 975 | 3,319 | 540 |
| Ventura County [CA] | 8,010 | 897 | 4,025 | 548 |
| Monmouth County [NJ] | 7,877 | 787 | 3,402 | 510 |
| Essex County [NJ] | 7,655 | 767 | 2,893 | 467 |
| New Haven County [CT] | 7,646 | 978 | 3,574 | 584 |
| Mercer County [NJ] | 7,523 | 904 | 3,010 | 554 |
| St. Louis County [MO] | 7,435 | 749 | 3,932 | 525 |
| San Joaquin County [CA] | 7,188 | 1,036 | 4,668 | 811 |
| Howard County [MD] | 7,185 | 822 | 2,978 | 512 |
| Fairfield County [CT] | 6,967 | 830 | 2,987 | 422 |
| Tarrant County [TX] | 6,809 | 1,011 | 2,769 | 489 |
| Lake County [IL] | 6,723 | 814 | 2,524 | 435 |
| Salt Lake County [UT] | 6,594 | 837 | 3,416 | 457 |
| Orange County [FL] | 6,526 | 1,274 | 3,504 | 843 |
| Washington County [OR] | 6,488 | 901 | 2,858 | 513 |
| Pima County [AZ] | 6,334 | 1,134 | 3,074 | 580 |
| Bronx County [NY] | 6,303 | 803 | 4,232 | 570 |
| Yolo County [CA] | 6,219 | 728 | 2,944 | 473 |
| DeKalb County [GA] | 6,184 | 695 | 3,451 | 516 |
| Denton County [TX] | 6,147 | 917 | 3,122 | 655 |
| Monroe County [NY] | 5,682 | 728 | 2,830 | 483 |
| Worcester County [MA] | 5,571 | 656 | 2,756 | 485 |
| Erie County [NY] | 5,523 | 613 | 2,232 | 396 |
| New Castle County [DE] | 5,452 | 659 | 2,634 | 466 |
| Dane County [WI] | 5,417 | 720 | 2,728 | 496 |
| Baltimore County [MD] | 5,368 | 794 | 3,022 | 595 |
| Hartford County [CT] | 5,255 | 627 | 2,472 | 472 |
| Wayne County [MI] | 5,204 | 612 | 2,526 | 421 |
| Prince George s County [MD] | 5,175 | 630 | 2,661 | 452 |
| Palm Beach County [FL] | 5,041 | 759 | 2,801 | 605 |
| Fresno County [CA] | 5,014 | 748 | 2,666 | 517 |
| Mecklenburg County [NC] | 4,810 | 837 | 2,444 | 543 |
| Delaware County [PA] | 4,809 | 703 | 2,490 | 470 |
| Cobb County [GA] | 4,610 | 744 | 1,728 | 387 |
| Camden County [NJ] | 4,596 | 718 | 2,647 | 435 |
| Essex County [MA] | 4,527 | 648 | 2,085 | 356 |
| Hillsborough County [FL] | 4,473 | 765 | 1,864 | 452 |
| Providence County [RI] | 4,358 | 685 | 2,404 | 500 |
| Bexar County [TX] | 4,350 | 647 | 2,152 | 419 |
| Ramsey County [MN] | 4,317 | 586 | 1,804 | 407 |
| District of Columbia [DC] | 4,306 | 571 | 1,644 | 378 |
| Chester County [PA] | 4,046 | 539 | 1,681 | 272 |
| Union County [NJ] | 3,987 | 700 | 1,733 | 381 |
| Santa Barbara County [CA] | 3,804 | 535 | 1,580 | 312 |
| Marion County [IN] | 3,743 | 729 | 2,754 | 618 |
| Johnson County [KS] | 3,683 | 607 | 1,490 | 401 |
| Loudoun County [VA] | 3,674 | 699 | 1,558 | 338 |
| Will County [IL] | 3,607 | 649 | 1,899 | 412 |
| Albany County [NY] | 3,458 | 505 | 1,772 | 392 |
| Shelby County [TN] | 3,330 | 600 | 1,476 | 363 |
| Onondaga County [NY] | 3,327 | 462 | 1,657 | 321 |
| Arapahoe County [CO] | 3,285 | 600 | 1,793 | 419 |
| Atlantic County [NJ] | 3,162 | 809 | 2,150 | 595 |
| Solano County [CA] | 3,155 | 587 | 1,591 | 345 |
| Milwaukee County [WI] | 2,974 | 516 | 1,761 | 456 |
| Denver County [CO] | 2,955 | 522 | 1,406 | 264 |
| Baltimore city [MD] | 2,858 | 367 | 1,265 | 283 |
| Oklahoma County [OK] | 2,802 | 449 | 1,451 | 282 |
| Hamilton County [OH] | 2,761 | 463 | 1,057 | 254 |
| Bucks County [PA] | 2,756 | 496 | 1,130 | 277 |
| Arlington County [VA] | 2,704 | 543 | 994 | 369 |
| Clark County [WA] | 2,651 | 443 | 1,413 | 318 |
| Rockland County [NY] | 2,615 | 570 | 1,336 | 412 |
| Washoe County [NV] | 2,565 | 541 | 1,219 | 323 |
| Pinellas County [FL] | 2,563 | 548 | 1,520 | 445 |
| Macomb County [MI] | 2,556 | 447 | 1,523 | 317 |
| Sonoma County [CA] | 2,537 | 464 | 1,290 | 316 |
| Duval County [FL] | 2,533 | 711 | 1,207 | 370 |
| Davidson County [TN] | 2,467 | 507 | 1,166 | 393 |
| Henrico County [VA] | 2,431 | 524 | 1,131 | 351 |
| Stanislaus County [CA] | 2,394 | 651 | 1,304 | 377 |
| Pierce County [WA] | 2,341 | 414 | 1,086 | 248 |
| Hillsborough County [NH] | 2,198 | 484 | 1,249 | 338 |
| Monterey County [CA] | 2,116 | 430 | 907 | 264 |
| Bernalillo County [NM] | 2,096 | 369 | 1,150 | 259 |
| Passaic County [NJ] | 2,078 | 417 | 1,206 | 305 |
| Guilford County [NC] | 2,040 | 423 | 928 | 260 |
| Placer County [CA] | 2,005 | 475 | 917 | 272 |
| Anne Arundel County [MD] | 1,980 | 417 | 685 | 245 |
| Prince William County [VA] | 1,968 | 412 | 776 | 209 |
| Virginia Beach city [VA] | 1,943 | 409 | 1,013 | 233 |
| Jefferson Parish [LA] | 1,937 | 529 | 1,015 | 389 |
| Jefferson County [KY] | 1,879 | 375 | 923 | 271 |
| Bristol County [MA] | 1,876 | 503 | 892 | 262 |
| Burlington County [NJ] | 1,843 | 383 | 904 | 230 |
| El Paso County [CO] | 1,816 | 481 | 956 | 302 |
| Polk County [IA] | 1,802 | 498 | 779 | 285 |
| Kern County [CA] | 1,744 | 426 | 901 | 282 |
| Dakota County [MN] | 1,690 | 463 | 871 | 294 |
| Orange County [NY] | 1,667 | 518 | 753 | 246 |
| Kane County [IL] | 1,449 | 425 | 595 | 251 |
| Hampden County [MA] | 1,407 | 367 | 785 | 251 |
| Lancaster County [PA] | 1,402 | 349 | 881 | 277 |
| Plymouth County [MA] | 1,197 | 381 | 496 | 191 |
| Ocean County [NJ] | 1,120 | 344 | 636 | 234 |
| Lee County [FL] | 936 | 303 | 426 | 174 |
| Anchorage Municipality [AK] | 882 | 363 | 519 | 279 |
| Maui County [HI] | 827 | 566 | 448 | 361 |
| Collier County [FL] | 746 | 328 | 445 | 252 |
| Hawaii County [HI] | 463 | 180 | 182 | 98 |
| San Juan County [NM] | 51 | 62 | 27 | 37 |
| Navajo County [AZ] | 35 | 42 | (B) | - |
| City / Metropolitan area / CBSA | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| New York-Newark-Jersey City [NY] | 582,192 | 6,290 | 364,299 | 5,521 |
| Los Angeles-Long Beach-Anaheim [CA] | 415,719 | 5,564 | 239,576 | 4,201 |
| San Francisco-Oakland-Hayward [CA] | 349,087 | 5,470 | 203,434 | 3,738 |
| San Jose-Sunnyvale-Santa Clara [CA] | 127,247 | 3,753 | 61,687 | 2,160 |
| Boston-Cambridge-Newton [MA-NH] | 96,362 | 2,820 | 51,325 | 1,940 |
| Chicago-Naperville-Elgin [IL-IN] | 84,605 | 2,840 | 44,600 | 1,957 |
| Washington-Arlington-Alexandria [DC-VA-MD-WV] | 79,660 | 2,419 | 35,954 | 1,658 |
| Seattle-Tacoma-Bellevue [WA] | 70,947 | 2,190 | 36,399 | 1,705 |
| Houston-The Woodlands-Sugar Land [TX] | 64,650 | 2,689 | 32,227 | 1,776 |
| Philadelphia-Camden-Wilmington [PA-NJ-DE-MD] | 59,806 | 2,608 | 33,585 | 1,739 |
| Dallas-Fort Worth-Arlington [TX] | 44,202 | 2,434 | 20,984 | 1,510 |
| San Diego-Carlsbad [CA] | 41,138 | 2,162 | 20,296 | 1,294 |
| Sacramento-Roseville-Arden-Arcade [CA] | 40,432 | 2,517 | 24,220 | 1,708 |
| Riverside-San Bernardino-Ontario [CA] | 37,306 | 2,468 | 20,495 | 1,631 |
| Atlanta-Sandy Springs-Roswell [GA] | 35,388 | 1,838 | 17,726 | 1,261 |
| Urban Honolulu [HI] | 29,933 | 1,628 | 19,142 | 1,175 |
| Las Vegas-Henderson-Paradise [NV] | 24,346 | 1,639 | 14,543 | 1,161 |
| Portland-Vancouver-Hillsboro [OR-WA] | 22,554 | 1,585 | 11,762 | 982 |
| Miami-Fort Lauderdale-West Palm Beach [FL] | 22,078 | 1,616 | 12,083 | 1,124 |
| Phoenix-Mesa-Scottsdale [AZ] | 20,678 | 1,437 | 10,346 | 888 |
| Baltimore-Columbia-Towson [MD] | 18,594 | 1,341 | 8,498 | 950 |
| Detroit-Warren-Dearborn [MI] | 18,297 | 1,059 | 8,413 | 701 |
| Minneapolis-St. Paul-Bloomington [MN-WI] | 18,197 | 1,291 | 7,638 | 779 |
| Austin-Round Rock [TX] | 13,324 | 1,161 | 5,018 | 621 |
| Denver-Aurora-Lakewood [CO] | 12,092 | 1,236 | 6,211 | 768 |
| Columbus [OH] | 11,655 | 818 | 5,466 | 622 |
| St. Louis [MO-IL] | 10,868 | 915 | 5,594 | 628 |
| Pittsburgh [PA] | 10,215 | 734 | 4,850 | 601 |
| Cleveland-Elyria [OH] | 10,198 | 811 | 5,378 | 522 |
| Orlando-Kissimmee-Sanford [FL] | 9,858 | 1,499 | 5,222 | 1,039 |
| Ann Arbor [MI] | 8,632 | 667 | 3,374 | 531 |
| Raleigh [NC] | 8,344 | 884 | 3,323 | 557 |
| Indianapolis-Carmel-Anderson [IN] | 8,269 | 995 | 4,592 | 745 |
| Tampa-St. Petersburg-Clearwater [FL] | 8,091 | 1,028 | 3,968 | 716 |
| Oxnard-Thousand Oaks-Ventura [CA] | 8,010 | 897 | 4,025 | 548 |
| Providence-Warwick [RI-MA] | 7,949 | 891 | 4,245 | 597 |
| New Haven-Milford [CT] | 7,646 | 978 | 3,574 | 584 |
| Trenton [NJ] | 7,523 | 904 | 3,010 | 554 |
| Cincinnati [OH-KY-IN] | 7,338 | 888 | 3,369 | 505 |
| Hartford-West Hartford-East Hartford [CT] | 7,314 | 816 | 3,002 | 533 |
| Stockton-Lodi [CA] | 7,188 | 1,036 | 4,668 | 811 |
| Kansas City [MO-KS] | 7,044 | 839 | 3,707 | 594 |
| Bridgeport-Stamford-Norwalk [CT] | 6,967 | 830 | 2,987 | 422 |
| Albany-Schenectady-Troy [NY] | 6,948 | 734 | 3,415 | 492 |
| Charlotte-Concord-Gastonia [NC-SC] | 6,788 | 853 | 3,433 | 612 |
| Salt Lake City [UT] | 6,768 | 855 | 3,511 | 465 |
| Tucson [AZ] | 6,334 | 1,134 | 3,074 | 580 |
| Rochester [NY] | 6,317 | 761 | 3,173 | 518 |
| Buffalo-Cheektowaga-Niagara Falls [NY] | 6,249 | 658 | 2,699 | 463 |
| Durham-Chapel Hill [NC] | 6,147 | 687 | 2,420 | 446 |
| Worcester [MA-CT] | 5,963 | 672 | 2,935 | 493 |
| Madison [WI] | 5,474 | 724 | 2,750 | 497 |
| Virginia Beach-Norfolk-Newport News [VA-NC] | 5,212 | 701 | 2,341 | 381 |
| Fresno [CA] | 5,014 | 748 | 2,666 | 517 |
| Milwaukee-Waukesha-West Allis [WI] | 5,011 | 692 | 2,575 | 488 |
| San Antonio-New Braunfels [TX] | 4,909 | 695 | 2,295 | 428 |
| Richmond [VA] | 4,822 | 650 | 2,188 | 423 |
| Lansing-East Lansing [MI] | 4,773 | 507 | 3,460 | 427 |
| Nashville-Davidson-Murfreesboro-Franklin [TN] | 4,548 | 896 | 2,186 | 596 |
| Oklahoma City [OK] | 4,519 | 607 | 2,255 | 370 |
| Memphis [TN-MS-AR] | 3,926 | 669 | 1,857 | 427 |
| New Orleans-Metairie [LA] | 3,826 | 608 | 1,915 | 451 |
| Allentown-Bethlehem-Easton [PA-NJ] | 3,825 | 628 | 1,722 | 348 |
| Santa Maria-Santa Barbara [CA] | 3,804 | 535 | 1,580 | 312 |
| Jacksonville [FL] | 3,750 | 871 | 1,871 | 472 |
| Syracuse [NY] | 3,597 | 481 | 1,792 | 332 |
| Akron [OH] | 3,441 | 529 | 1,778 | 383 |
| Atlantic City-Hammonton [NJ] | 3,162 | 809 | 2,150 | 595 |
| Vallejo-Fairfield [CA] | 3,155 | 587 | 1,591 | 345 |
| Springfield [MA] | 3,056 | 605 | 1,718 | 444 |
| Dayton [OH] | 2,722 | 469 | 1,383 | 283 |
| Baton Rouge [LA] | 2,691 | 500 | 1,540 | 351 |
| Louisville Jefferson County [KY] | 2,605 | 378 | 1,258 | 270 |
| Reno [NV] | 2,565 | 541 | 1,219 | 323 |
| Santa Rosa [CA] | 2,537 | 464 | 1,290 | 316 |
| Modesto [CA] | 2,394 | 651 | 1,304 | 377 |
| Albuquerque [NM] | 2,281 | 413 | 1,194 | 268 |
| Tulsa [OK] | 2,261 | 376 | 1,155 | 246 |
| Greensboro-High Point [NC] | 2,233 | 421 | 1,047 | 265 |
| Grand Rapids-Wyoming [MI] | 2,231 | 482 | 841 | 274 |
| Manchester-Nashua [NH] | 2,198 | 484 | 1,249 | 338 |
| Salinas [CA] | 2,116 | 430 | 907 | 264 |
| Des Moines-West Des Moines [IA] | 1,965 | 515 | 867 | 303 |
| Harrisburg-Carlisle [PA] | 1,883 | 410 | 891 | 244 |
| Colorado Springs [CO] | 1,862 | 483 | 1,002 | 301 |
| Omaha-Council Bluffs [NE-IA] | 1,830 | 387 | 1,099 | 313 |
| Bakersfield [CA] | 1,744 | 426 | 901 | 282 |
| New York-Newark-Jersey City [NY-NJ-PA] | 1,608 | 457 | 913 | 353 |
| Lancaster [PA] | 1,402 | 349 | 881 | 277 |
| Spokane-Spokane Valley [WA] | 1,232 | 305 | 748 | 250 |
| Portland-South Portland [ME] | 1,224 | 356 | 715 | 247 |
| Anchorage [AK] | 1,002 | 392 | 560 | 286 |
| Deltona-Daytona Beach-Ormond Beach [FL] | 986 | 343 | 656 | 285 |
| Cape Coral-Fort Myers [FL] | 936 | 303 | 426 | 174 |
| Kahului-Wailuku-Lahaina [HI] | 831 | 566 | 449 | 362 |
| Lafayette [LA] | 758 | 330 | 448 | 274 |
| Naples-Immokalee-Marco Island [FL] | 746 | 328 | 445 | 252 |
| Hilo [HI] | 463 | 180 | 182 | 98 |
| Farmington [NM] | 51 | 62 | 27 | 37 |
| Show Low [AZ] | 35 | 42 | (B) | - |