| County | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| Los Angeles County [CA] | 30,112 | 2,022 | 16,858 | 1,179 |
| Middlesex County [MA] | 12,064 | 1,243 | 6,427 | 757 |
| San Joaquin County [CA] | 9,098 | 1,202 | 4,721 | 639 |
| Philadelphia County [PA] | 7,918 | 1,302 | 4,559 | 973 |
| King County [WA] | 7,229 | 970 | 3,842 | 681 |
| Orange County [CA] | 5,698 | 911 | 2,673 | 442 |
| Pierce County [WA] | 4,808 | 806 | 1,986 | 404 |
| San Diego County [CA] | 4,785 | 659 | 2,291 | 380 |
| Fresno County [CA] | 4,520 | 893 | 2,086 | 473 |
| Essex County [MA] | 4,389 | 782 | 2,196 | 454 |
| Santa Clara County [CA] | 3,961 | 803 | 2,413 | 527 |
| Providence County [RI] | 3,937 | 742 | 2,018 | 378 |
| San Bernardino County [CA] | 3,689 | 1,596 | 1,564 | 521 |
| Alameda County [CA] | 3,481 | 631 | 1,909 | 462 |
| Riverside County [CA] | 3,279 | 848 | 1,553 | 389 |
| Harris County [TX] | 3,246 | 834 | 1,962 | 557 |
| Stanislaus County [CA] | 3,074 | 566 | 1,276 | 287 |
| Snohomish County [WA] | 2,712 | 778 | 1,849 | 628 |
| Cook County [IL] | 2,103 | 725 | 1,245 | 502 |
| Sacramento County [CA] | 2,025 | 553 | 1,077 | 382 |
| Gwinnett County [GA] | 2,015 | 694 | 1,116 | 416 |
| Franklin County [OH] | 1,995 | 649 | 887 | 331 |
| Dallas County [TX] | 1,931 | 701 | 1,197 | 442 |
| Bristol County [MA] | 1,735 | 470 | 959 | 258 |
| Guilford County [NC] | 1,679 | 577 | 740 | 253 |
| Maricopa County [AZ] | 1,612 | 608 | 591 | 196 |
| Mecklenburg County [NC] | 1,490 | 523 | 688 | 297 |
| Fairfax County [VA] | 1,478 | 498 | 932 | 321 |
| Hennepin County [MN] | 1,456 | 500 | 868 | 349 |
| Salt Lake County [UT] | 1,386 | 462 | 822 | 278 |
| Washington County [OR] | 1,268 | 404 | 657 | 240 |
| San Francisco County [CA] | 1,212 | 571 | 662 | 307 |
| Montgomery County [MD] | 1,167 | 467 | 511 | 162 |
| Clark County [NV] | 1,160 | 384 | 593 | 258 |
| Ramsey County [MN] | 1,140 | 590 | 348 | 135 |
| Suffolk County [MA] | 1,106 | 353 | 592 | 225 |
| Duval County [FL] | 1,066 | 392 | 672 | 250 |
| Contra Costa County [CA] | 1,035 | 425 | 568 | 228 |
| Fairfield County [CT] | 1,030 | 397 | 640 | 241 |
| Henrico County [VA] | 903 | 313 | 418 | 214 |
| Multnomah County [OR] | 886 | 373 | 472 | 225 |
| Bronx County [NY] | 883 | 409 | 382 | 179 |
| Delaware County [PA] | 827 | 306 | 510 | 234 |
| Denver County [CO] | 818 | 523 | 458 | 332 |
| Sonoma County [CA] | 803 | 378 | 395 | 218 |
| Dakota County [MN] | 791 | 254 | 609 | 234 |
| Denton County [TX] | 723 | 370 | 271 | 153 |
| Kings County [NY] | 671 | 269 | 301 | 164 |
| DuPage County [IL] | 639 | 324 | 272 | 124 |
| Pinellas County [FL] | 576 | 228 | 367 | 187 |
| Tarrant County [TX] | 553 | 301 | 299 | 179 |
| New Haven County [CT] | 540 | 280 | 275 | 153 |
| Kern County [CA] | 531 | 271 | 231 | 130 |
| Cuyahoga County [OH] | 509 | 246 | 258 | 123 |
| Prince George s County [MD] | 507 | 397 | 180 | 129 |
| Queens County [NY] | 506 | 309 | 197 | 172 |
| Lancaster County [PA] | 494 | 238 | 345 | 175 |
| Hamilton County [OH] | 482 | 243 | 269 | 173 |
| Loudoun County [VA] | 466 | 269 | 209 | 130 |
| Hampden County [MA] | 462 | 222 | 268 | 149 |
| Worcester County [MA] | 432 | 238 | 124 | 96 |
| DeKalb County [GA] | 416 | 258 | 196 | 155 |
| Hartford County [CT] | 412 | 238 | 118 | 92 |
| Bucks County [PA] | 406 | 276 | 268 | 195 |
| Montgomery County [PA] | 390 | 158 | 143 | 71 |
| Jefferson County [KY] | 388 | 342 | 146 | 161 |
| Prince William County [VA] | 386 | 274 | 117 | 119 |
| Norfolk County [MA] | 383 | 181 | 170 | 92 |
| Dane County [WI] | 377 | 303 | 199 | 227 |
| Arapahoe County [CO] | 372 | 222 | 173 | 115 |
| Clark County [WA] | 354 | 204 | 210 | 141 |
| Camden County [NJ] | 325 | 211 | 255 | 169 |
| Monroe County [NY] | 324 | 151 | 127 | 83 |
| Wake County [NC] | 319 | 282 | 101 | 94 |
| Fort Bend County [TX] | 317 | 243 | 193 | 174 |
| Hillsborough County [NH] | 314 | 202 | 91 | 57 |
| Onondaga County [NY] | 303 | 182 | 113 | 88 |
| Davidson County [TN] | 294 | 176 | 126 | 97 |
| Shelby County [TN] | 293 | 280 | 188 | 147 |
| Pima County [AZ] | 285 | 155 | 148 | 100 |
| Arlington County [VA] | 264 | 158 | 136 | 126 |
| Polk County [IA] | 258 | 109 | 151 | 84 |
| Oklahoma County [OK] | 250 | 181 | 184 | 131 |
| Plymouth County [MA] | 244 | 152 | 124 | 103 |
| Suffolk County [NY] | 238 | 350 | 104 | 152 |
| Ventura County [CA] | 237 | 138 | 121 | 79 |
| Lake County [IL] | 228 | 166 | 167 | 126 |
| Collin County [TX] | 224 | 171 | 166 | 111 |
| Kane County [IL] | 223 | 226 | 106 | 112 |
| Travis County [TX] | 219 | 167 | 130 | 131 |
| Orange County [FL] | 207 | 148 | 91 | 80 |
| Bexar County [TX] | 207 | 134 | 153 | 114 |
| Santa Barbara County [CA] | 182 | 112 | 18 | 30 |
| Orange County [NY] | 178 | 125 | 104 | 88 |
| New York County [NY] | 169 | 85 | 66 | 47 |
| Allegheny County [PA] | 164 | 129 | 87 | 75 |
| Honolulu County [HI] | 163 | 97 | 37 | 45 |
| Cobb County [GA] | 162 | 124 | 74 | 69 |
| Miami-Dade County [FL] | 157 | 171 | 146 | 175 |
| Johnson County [KS] | 151 | 121 | 47 | 40 |
| Macomb County [MI] | 151 | 109 | 41 | 44 |
| Burlington County [NJ] | 149 | 116 | 73 | 61 |
| Monterey County [CA] | 142 | 95 | 111 | 91 |
| Richmond County [NY] | 136 | 135 | 65 | 84 |
| Chester County [PA] | 130 | 116 | 48 | 51 |
| Anchorage Municipality [AK] | 129 | 100 | 93 | 86 |
| Will County [IL] | 128 | 110 | 26 | 28 |
| Westchester County [NY] | 120 | 97 | 70 | 81 |
| Yolo County [CA] | 119 | 95 | 52 | 47 |
| Anne Arundel County [MD] | 118 | 110 | 56 | 54 |
| Hillsborough County [FL] | 117 | 71 | 91 | 64 |
| Oakland County [MI] | 115 | 88 | 72 | 59 |
| Morris County [NJ] | 112 | 172 | 66 | 101 |
| San Mateo County [CA] | 109 | 93 | 62 | 68 |
| Fulton County [GA] | 105 | 152 | 14 | 22 |
| Marion County [IN] | 100 | 105 | 60 | 97 |
| Jefferson Parish [LA] | 92 | 83 | 64 | 58 |
| Placer County [CA] | 87 | 94 | 65 | 65 |
| Erie County [NY] | 79 | 57 | 34 | 38 |
| Virginia Beach city [VA] | 78 | 75 | 63 | 71 |
| Middlesex County [NJ] | 77 | 100 | 77 | 100 |
| Hawaii County [HI] | 74 | 88 | (B) | - |
| Rockland County [NY] | 62 | 71 | (B) | - |
| El Paso County [CO] | 56 | 45 | 23 | 27 |
| Solano County [CA] | 55 | 55 | (B) | - |
| Milwaukee County [WI] | 54 | 53 | 30 | 30 |
| District of Columbia [DC] | 53 | 50 | 18 | 27 |
| Broward County [FL] | 52 | 52 | 23 | 27 |
| Baltimore County [MD] | 52 | 61 | 33 | 43 |
| Wayne County [MI] | 50 | 50 | 4 | 8 |
| Navajo County [AZ] | 48 | 57 | 48 | 57 |
| New Castle County [DE] | 41 | 47 | 11 | 18 |
| Palm Beach County [FL] | 41 | 59 | 31 | 58 |
| Nassau County [NY] | 40 | 31 | (B) | - |
| Maui County [HI] | 37 | 40 | 11 | 16 |
| Atlantic County [NJ] | 37 | 63 | 14 | 24 |
| Bernalillo County [NM] | 34 | 45 | 28 | 39 |
| Washtenaw County [MI] | 33 | 38 | 28 | 36 |
| Washoe County [NV] | 33 | 40 | 24 | 37 |
| St. Louis County [MO] | 26 | 40 | 26 | 40 |
| Mercer County [NJ] | 24 | 49 | 5 | 22 |
| Albany County [NY] | 16 | 25 | 9 | 14 |
| Baltimore city [MD] | 13 | 19 | 6 | 9 |
| Howard County [MD] | 7 | 12 | (B) | - |
| Somerset County [NJ] | 5 | 8 | 5 | 8 |
| Union County [NJ] | 5 | 9 | (B) | - |
| Essex County [NJ] | 2 | 4 | 2 | 4 |
| City / Metropolitan area / CBSA | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| Los Angeles-Long Beach-Anaheim [CA] | 35,810 | 2,159 | 19,531 | 1,299 |
| Boston-Cambridge-Newton [MA-NH] | 18,384 | 1,500 | 9,558 | 880 |
| Seattle-Tacoma-Bellevue [WA] | 14,749 | 1,199 | 7,677 | 916 |
| Philadelphia-Camden-Wilmington [PA-NJ-DE-MD] | 10,186 | 1,340 | 5,867 | 985 |
| Stockton-Lodi [CA] | 9,098 | 1,202 | 4,721 | 639 |
| Riverside-San Bernardino-Ontario [CA] | 6,968 | 1,832 | 3,117 | 643 |
| San Francisco-Oakland-Hayward [CA] | 6,031 | 1,002 | 3,302 | 650 |
| Providence-Warwick [RI-MA] | 6,022 | 814 | 3,102 | 458 |
| San Diego-Carlsbad [CA] | 4,785 | 659 | 2,291 | 380 |
| Washington-Arlington-Alexandria [DC-VA-MD-WV] | 4,701 | 936 | 2,236 | 410 |
| Minneapolis-St. Paul-Bloomington [MN-WI] | 4,597 | 940 | 2,501 | 521 |
| Fresno [CA] | 4,520 | 893 | 2,086 | 473 |
| Houston-The Woodlands-Sugar Land [TX] | 4,328 | 879 | 2,460 | 575 |
| Atlanta-Sandy Springs-Roswell [GA] | 4,218 | 986 | 2,159 | 582 |
| San Jose-Sunnyvale-Santa Clara [CA] | 4,166 | 820 | 2,585 | 533 |
| Dallas-Fort Worth-Arlington [TX] | 3,607 | 904 | 2,081 | 554 |
| Chicago-Naperville-Elgin [IL-IN] | 3,483 | 814 | 1,837 | 534 |
| New York-Newark-Jersey City [NY] | 3,231 | 775 | 1,462 | 395 |
| Modesto [CA] | 3,074 | 566 | 1,276 | 287 |
| Portland-Vancouver-Hillsboro [OR-WA] | 2,885 | 652 | 1,495 | 368 |
| Sacramento-Roseville-Arden-Arcade [CA] | 2,282 | 576 | 1,232 | 385 |
| Columbus [OH] | 2,182 | 673 | 1,024 | 371 |
| Denver-Aurora-Lakewood [CO] | 1,939 | 547 | 867 | 347 |
| Phoenix-Mesa-Scottsdale [AZ] | 1,703 | 607 | 624 | 194 |
| Greensboro-High Point [NC] | 1,679 | 577 | 740 | 253 |
| Charlotte-Concord-Gastonia [NC-SC] | 1,651 | 531 | 742 | 300 |
| Jacksonville [FL] | 1,549 | 621 | 723 | 267 |
| Richmond [VA] | 1,531 | 426 | 771 | 296 |
| Salt Lake City [UT] | 1,436 | 455 | 872 | 286 |
| Las Vegas-Henderson-Paradise [NV] | 1,160 | 384 | 593 | 258 |
| Bridgeport-Stamford-Norwalk [CT] | 1,030 | 397 | 640 | 241 |
| Springfield [MA] | 1,024 | 515 | 506 | 236 |
| Grand Rapids-Wyoming [MI] | 914 | 318 | 454 | 170 |
| Portland-South Portland [ME] | 912 | 392 | 576 | 239 |
| Virginia Beach-Norfolk-Newport News [VA-NC] | 899 | 524 | 365 | 244 |
| Kansas City [MO-KS] | 825 | 393 | 361 | 204 |
| Santa Rosa [CA] | 803 | 378 | 395 | 218 |
| Cincinnati [OH-KY-IN] | 787 | 342 | 528 | 290 |
| Tampa-St. Petersburg-Clearwater [FL] | 709 | 238 | 458 | 185 |
| Deltona-Daytona Beach-Ormond Beach [FL] | 701 | 344 | 515 | 286 |
| Cleveland-Elyria [OH] | 569 | 247 | 285 | 120 |
| Hartford-West Hartford-East Hartford [CT] | 569 | 285 | 175 | 109 |
| New Haven-Milford [CT] | 540 | 280 | 275 | 153 |
| Bakersfield [CA] | 531 | 271 | 231 | 130 |
| Lancaster [PA] | 494 | 238 | 345 | 175 |
| Worcester [MA-CT] | 441 | 238 | 133 | 97 |
| Nashville-Davidson-Murfreesboro-Franklin [TN] | 402 | 201 | 161 | 99 |
| Louisville Jefferson County [KY] | 388 | 342 | 146 | 161 |
| Madison [WI] | 377 | 303 | 199 | 227 |
| Memphis [TN-MS-AR] | 370 | 281 | 204 | 146 |
| Orlando-Kissimmee-Sanford [FL] | 367 | 247 | 232 | 195 |
| Rochester [NY] | 354 | 152 | 139 | 81 |
| Austin-Round Rock [TX] | 340 | 179 | 193 | 141 |
| Raleigh [NC] | 330 | 281 | 101 | 94 |
| Syracuse [NY] | 322 | 182 | 113 | 88 |
| Detroit-Warren-Dearborn [MI] | 316 | 129 | 117 | 68 |
| Manchester-Nashua [NH] | 314 | 202 | 91 | 57 |
| Tucson [AZ] | 285 | 155 | 148 | 100 |
| Oklahoma City [OK] | 260 | 183 | 194 | 133 |
| Des Moines-West Des Moines [IA] | 258 | 109 | 151 | 84 |
| San Antonio-New Braunfels [TX] | 253 | 145 | 193 | 131 |
| Miami-Fort Lauderdale-West Palm Beach [FL] | 250 | 184 | 200 | 190 |
| Oxnard-Thousand Oaks-Ventura [CA] | 237 | 138 | 121 | 79 |
| Spokane-Spokane Valley [WA] | 214 | 190 | 58 | 63 |
| Pittsburgh [PA] | 207 | 126 | 105 | 71 |
| New Orleans-Metairie [LA] | 196 | 122 | 128 | 79 |
| Indianapolis-Carmel-Anderson [IN] | 193 | 156 | 123 | 122 |
| Baltimore-Columbia-Towson [MD] | 190 | 137 | 95 | 72 |
| Santa Maria-Santa Barbara [CA] | 182 | 112 | 18 | 30 |
| Urban Honolulu [HI] | 163 | 97 | 37 | 45 |
| New York-Newark-Jersey City [NY-NJ-PA] | 154 | 110 | 105 | 77 |
| Akron [OH] | 150 | 130 | 105 | 95 |
| Salinas [CA] | 142 | 95 | 111 | 91 |
| Anchorage [AK] | 129 | 100 | 93 | 86 |
| Harrisburg-Carlisle [PA] | 101 | 85 | 69 | 70 |
| Allentown-Bethlehem-Easton [PA-NJ] | 95 | 69 | 47 | 42 |
| Durham-Chapel Hill [NC] | 81 | 89 | 81 | 89 |
| Buffalo-Cheektowaga-Niagara Falls [NY] | 79 | 57 | 34 | 38 |
| Hilo [HI] | 74 | 88 | (B) | - |
| St. Louis [MO-IL] | 74 | 70 | 57 | 63 |
| Dayton [OH] | 63 | 79 | (B) | - |
| Colorado Springs [CO] | 56 | 45 | 23 | 27 |
| Vallejo-Fairfield [CA] | 55 | 55 | (B) | - |
| Milwaukee-Waukesha-West Allis [WI] | 54 | 53 | 30 | 30 |
| Tulsa [OK] | 52 | 41 | 8 | 9 |
| Show Low [AZ] | 48 | 57 | 48 | 57 |
| Atlantic City-Hammonton [NJ] | 37 | 63 | 14 | 24 |
| Kahului-Wailuku-Lahaina [HI] | 37 | 40 | 11 | 16 |
| Albuquerque [NM] | 34 | 45 | 28 | 39 |
| Ann Arbor [MI] | 33 | 38 | 28 | 36 |
| Reno [NV] | 33 | 40 | 24 | 37 |
| Trenton [NJ] | 24 | 49 | 5 | 22 |
| Omaha-Council Bluffs [NE-IA] | 22 | 30 | 13 | 19 |
| Albany-Schenectady-Troy [NY] | 16 | 25 | 9 | 14 |
| Lansing-East Lansing [MI] | 13 | 22 | (B) | - |
| Baton Rouge [LA] | 11 | 22 | 11 | 22 |