| Country | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| United States | 298,287 | 5,640 | 71,112 | 2,264 |
| State | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| Pennsylvania | 63,058 | 2,572 | 19,752 | 1,136 |
| Ohio | 41,220 | 2,146 | 15,195 | 1,255 |
| California | 25,660 | 1,519 | 3,162 | 400 |
| Indiana | 24,121 | 1,561 | 7,221 | 768 |
| New York | 17,931 | 1,221 | 4,371 | 479 |
| Florida | 13,769 | 1,325 | 1,647 | 415 |
| Wisconsin | 10,629 | 884 | 2,668 | 296 |
| Michigan | 9,372 | 810 | 2,473 | 382 |
| Texas | 7,628 | 899 | 621 | 165 |
| Missouri | 7,498 | 948 | 2,456 | 420 |
| Illinois | 6,411 | 652 | 1,240 | 286 |
| Kentucky | 5,345 | 968 | 1,848 | 507 |
| Georgia | 5,057 | 742 | 481 | 182 |
| Washington | 4,036 | 598 | 619 | 164 |
| Virginia | 3,873 | 491 | 393 | 141 |
| Iowa | 3,773 | 649 | 1,126 | 325 |
| Massachusetts | 3,737 | 577 | 329 | 187 |
| Maryland | 3,703 | 585 | 383 | 222 |
| New Jersey | 3,615 | 618 | 308 | 135 |
| North Carolina | 3,481 | 669 | 281 | 124 |
| Colorado | 3,275 | 589 | 246 | 115 |
| Tennessee | 3,117 | 670 | 378 | 183 |
| Arizona | 2,725 | 473 | 325 | 122 |
| Oregon | 2,443 | 321 | 216 | 90 |
| Minnesota | 2,406 | 323 | 593 | 159 |
| Connecticut | 2,027 | 415 | 175 | 107 |
| Utah | 2,015 | 393 | 248 | 103 |
| Kansas | 1,882 | 284 | 270 | 113 |
| Arkansas | 1,585 | 542 | 220 | 134 |
| Delaware | 1,349 | 420 | 485 | 189 |
| South Carolina | 1,241 | 273 | 115 | 70 |
| Nevada | 1,056 | 218 | 168 | 96 |
| Alabama | 935 | 280 | 86 | 61 |
| Oklahoma | 926 | 254 | 135 | 85 |
| New Mexico | 816 | 249 | 30 | 31 |
| Montana | 800 | 233 | 133 | 85 |
| Idaho | 786 | 211 | 172 | 86 |
| Hawaii | 550 | 158 | 24 | 19 |
| Maine | 528 | 184 | 129 | 97 |
| Nebraska | 498 | 150 | 79 | 48 |
| Louisiana | 490 | 187 | 24 | 26 |
| Vermont | 487 | 152 | 48 | 41 |
| New Hampshire | 452 | 133 | 89 | 64 |
| Mississippi | 344 | 142 | 12 | 19 |
| West Virginia | 340 | 181 | (B) | - |
| South Dakota | 322 | 104 | 51 | 33 |
| District of Columbia | 259 | 121 | (B) | - |
| Alaska | 249 | 83 | 13 | 20 |
| Rhode Island | 224 | 105 | 65 | 61 |
| North Dakota | 152 | 79 | 9 | 10 |
| Wyoming | 91 | 58 | (B) | - |
| Puerto Rico | 40 | 42 | (B) | - |
| County | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| Lancaster County [PA] | 23,750 | 1,830 | 7,417 | 874 |
| Los Angeles County [CA] | 5,364 | 676 | 844 | 203 |
| Orange County [CA] | 3,082 | 486 | 390 | 129 |
| Chester County [PA] | 2,805 | 687 | 1,102 | 492 |
| San Diego County [CA] | 2,145 | 379 | 195 | 97 |
| Harris County [TX] | 2,143 | 480 | 142 | 102 |
| New York County [NY] | 1,940 | 403 | 269 | 131 |
| Broward County [FL] | 1,862 | 458 | 178 | 177 |
| Riverside County [CA] | 1,766 | 389 | 290 | 119 |
| Cook County [IL] | 1,668 | 312 | 264 | 128 |
| Maricopa County [AZ] | 1,581 | 308 | 226 | 102 |
| Santa Clara County [CA] | 1,552 | 314 | 116 | 77 |
| Miami-Dade County [FL] | 1,532 | 538 | 270 | 164 |
| King County [WA] | 1,483 | 318 | 193 | 102 |
| Kings County [NY] | 1,481 | 302 | 357 | 111 |
| Palm Beach County [FL] | 1,279 | 344 | 279 | 132 |
| Alameda County [CA] | 1,144 | 264 | 102 | 69 |
| San Bernardino County [CA] | 1,075 | 236 | 226 | 91 |
| Fairfax County [VA] | 1,071 | 248 | 92 | 80 |
| Orange County [FL] | 1,031 | 316 | 104 | 93 |
| Fulton County [GA] | 1,027 | 312 | 92 | 85 |
| Salt Lake County [UT] | 1,025 | 229 | 187 | 96 |
| Sacramento County [CA] | 1,018 | 326 | 109 | 82 |
| Fairfield County [CT] | 1,015 | 301 | 92 | 77 |
| Contra Costa County [CA] | 1,014 | 218 | 76 | 55 |
| Westchester County [NY] | 993 | 340 | 53 | 68 |
| Middlesex County [MA] | 981 | 245 | 101 | 59 |
| Queens County [NY] | 930 | 242 | 180 | 111 |
| Montgomery County [PA] | 894 | 176 | 102 | 54 |
| Gwinnett County [GA] | 782 | 383 | 119 | 121 |
| Clark County [NV] | 777 | 173 | 155 | 97 |
| Pinellas County [FL] | 757 | 218 | 13 | 18 |
| Wake County [NC] | 733 | 283 | 29 | 36 |
| Suffolk County [MA] | 729 | 367 | 128 | 165 |
| Delaware County [PA] | 718 | 223 | 30 | 27 |
| Montgomery County [MD] | 705 | 229 | 51 | 56 |
| San Mateo County [CA] | 703 | 223 | 58 | 42 |
| San Francisco County [CA] | 661 | 196 | 36 | 35 |
| Cobb County [GA] | 622 | 279 | 85 | 87 |
| Duval County [FL] | 612 | 244 | 42 | 38 |
| Dallas County [TX] | 604 | 234 | 10 | 17 |
| DuPage County [IL] | 580 | 232 | 91 | 98 |
| Ventura County [CA] | 574 | 152 | 46 | 33 |
| Bucks County [PA] | 563 | 197 | 127 | 81 |
| Wayne County [MI] | 562 | 231 | 75 | 49 |
| Snohomish County [WA] | 555 | 258 | 62 | 48 |
| St. Louis County [MO] | 536 | 193 | 58 | 64 |
| Bronx County [NY] | 529 | 203 | 65 | 50 |
| Philadelphia County [PA] | 521 | 248 | 26 | 34 |
| Nassau County [NY] | 509 | 197 | 94 | 139 |
| Suffolk County [NY] | 484 | 168 | 16 | 19 |
| Santa Barbara County [CA] | 477 | 155 | 26 | 29 |
| Multnomah County [OR] | 453 | 156 | 18 | 19 |
| Pima County [AZ] | 445 | 200 | (B) | - |
| Hennepin County [MN] | 443 | 140 | 36 | 23 |
| Hillsborough County [FL] | 433 | 158 | 50 | 39 |
| Sonoma County [CA] | 427 | 207 | 93 | 92 |
| Fresno County [CA] | 426 | 152 | 43 | 36 |
| Norfolk County [MA] | 416 | 161 | 21 | 24 |
| Bergen County [NJ] | 416 | 155 | (B) | - |
| Washington County [OR] | 416 | 180 | 49 | 40 |
| Worcester County [MA] | 401 | 179 | 8 | 13 |
| Monroe County [NY] | 399 | 141 | 88 | 73 |
| Dane County [WI] | 389 | 176 | 32 | 37 |
| Lake County [IL] | 387 | 146 | 50 | 42 |
| Denton County [TX] | 386 | 170 | 57 | 45 |
| Lee County [FL] | 385 | 145 | 95 | 80 |
| Macomb County [MI] | 385 | 141 | 160 | 114 |
| Allegheny County [PA] | 367 | 174 | 80 | 69 |
| Hudson County [NJ] | 363 | 323 | (B) | - |
| New Haven County [CT] | 345 | 165 | 72 | 63 |
| Collin County [TX] | 345 | 146 | 48 | 55 |
| San Joaquin County [CA] | 326 | 131 | 40 | 44 |
| Baltimore city [MD] | 321 | 168 | (B) | - |
| Ocean County [NJ] | 317 | 151 | 60 | 60 |
| Franklin County [OH] | 315 | 136 | 66 | 41 |
| Tarrant County [TX] | 312 | 130 | 19 | 31 |
| Shelby County [TN] | 310 | 219 | (B) | - |
| Travis County [TX] | 309 | 115 | 42 | 37 |
| Cuyahoga County [OH] | 308 | 103 | 70 | 55 |
| Essex County [MA] | 307 | 128 | 17 | 21 |
| Milwaukee County [WI] | 304 | 154 | 40 | 60 |
| DeKalb County [GA] | 302 | 110 | (B) | - |
| Baltimore County [MD] | 300 | 163 | (B) | - |
| Morris County [NJ] | 299 | 126 | 27 | 35 |
| Somerset County [NJ] | 297 | 199 | 24 | 38 |
| Placer County [CA] | 283 | 129 | 50 | 51 |
| Bernalillo County [NM] | 277 | 107 | 17 | 21 |
| Mecklenburg County [NC] | 276 | 110 | 38 | 42 |
| Arapahoe County [CO] | 272 | 107 | 39 | 28 |
| Kane County [IL] | 272 | 168 | 31 | 41 |
| Honolulu County [HI] | 270 | 129 | 15 | 17 |
| Loudoun County [VA] | 270 | 135 | (B) | - |
| Clark County [WA] | 262 | 114 | 68 | 56 |
| District of Columbia [DC] | 259 | 121 | (B) | - |
| El Paso County [CO] | 246 | 102 | 18 | 33 |
| Virginia Beach city [VA] | 246 | 126 | 26 | 33 |
| Johnson County [KS] | 240 | 105 | 9 | 14 |
| Will County [IL] | 238 | 146 | 18 | 27 |
| Hawaii County [HI] | 236 | 81 | 9 | 10 |
| Hamilton County [OH] | 236 | 107 | 13 | 21 |
| Pierce County [WA] | 231 | 95 | 47 | 45 |
| Prince George s County [MD] | 229 | 132 | 23 | 25 |
| Monmouth County [NJ] | 227 | 111 | 25 | 38 |
| Stanislaus County [CA] | 225 | 92 | 48 | 38 |
| Bexar County [TX] | 221 | 101 | 12 | 16 |
| New Castle County [DE] | 218 | 116 | 29 | 28 |
| Hartford County [CT] | 217 | 94 | 6 | 11 |
| Plymouth County [MA] | 216 | 129 | 13 | 25 |
| Middlesex County [NJ] | 216 | 193 | 21 | 22 |
| Marion County [IN] | 210 | 83 | 28 | 29 |
| Henrico County [VA] | 209 | 118 | 13 | 21 |
| Anne Arundel County [MD] | 206 | 104 | 34 | 29 |
| Denver County [CO] | 199 | 100 | (B) | - |
| Solano County [CA] | 196 | 130 | 33 | 40 |
| Mercer County [NJ] | 189 | 110 | 24 | 30 |
| Fort Bend County [TX] | 189 | 125 | 38 | 44 |
| Washoe County [NV] | 188 | 106 | 13 | 23 |
| Jefferson County [KY] | 187 | 101 | (B) | - |
| Camden County [NJ] | 182 | 119 | (B) | - |
| Oakland County [MI] | 181 | 75 | 39 | 38 |
| Passaic County [NJ] | 181 | 92 | 40 | 48 |
| Monterey County [CA] | 175 | 113 | 19 | 17 |
| Yolo County [CA] | 172 | 75 | (B) | - |
| Washtenaw County [MI] | 170 | 75 | 22 | 31 |
| Guilford County [NC] | 166 | 95 | 50 | 54 |
| Albany County [NY] | 158 | 146 | 20 | 35 |
| Davidson County [TN] | 155 | 107 | 4 | 7 |
| Anchorage Municipality [AK] | 153 | 73 | (B) | - |
| Essex County [NJ] | 153 | 110 | 33 | 51 |
| Arlington County [VA] | 147 | 81 | 23 | 33 |
| Erie County [NY] | 141 | 78 | 9 | 16 |
| Atlantic County [NJ] | 133 | 169 | (B) | - |
| Howard County [MD] | 131 | 93 | (B) | - |
| Collier County [FL] | 130 | 67 | 6 | 10 |
| Orange County [NY] | 129 | 72 | 7 | 13 |
| Kern County [CA] | 127 | 78 | 8 | 14 |
| Hillsborough County [NH] | 124 | 66 | 33 | 39 |
| Hampden County [MA] | 122 | 75 | 7 | 12 |
| Union County [NJ] | 117 | 61 | 4 | 8 |
| Onondaga County [NY] | 117 | 57 | (B) | - |
| Providence County [RI] | 112 | 76 | 65 | 61 |
| Richmond County [NY] | 111 | 70 | (B) | - |
| Burlington County [NJ] | 105 | 80 | 9 | 11 |
| Bristol County [MA] | 102 | 77 | (B) | - |
| Prince William County [VA] | 99 | 87 | (B) | - |
| Ramsey County [MN] | 84 | 53 | (B) | - |
| Oklahoma County [OK] | 68 | 52 | (B) | - |
| Dakota County [MN] | 57 | 46 | 36 | 39 |
| San Juan County [NM] | 55 | 70 | (B) | - |
| Polk County [IA] | 54 | 45 | 24 | 21 |
| Rockland County [NY] | 46 | 37 | (B) | - |
| Maui County [HI] | 39 | 34 | (B) | - |
| Jefferson Parish [LA] | 23 | 25 | (B) | - |
| City / Metropolitan area / CBSA | Number of speakers | Margin of Error | Speak English less than "Very Well" | Margin of Error |
| Lancaster [PA] | 23,750 | 1,830 | 7,417 | 874 |
| New York-Newark-Jersey City [NY] | 10,211 | 865 | 1,340 | 282 |
| Los Angeles-Long Beach-Anaheim [CA] | 8,446 | 920 | 1,234 | 266 |
| Philadelphia-Camden-Wilmington [PA-NJ-DE-MD] | 6,288 | 871 | 1,425 | 505 |
| Cleveland-Elyria [OH] | 4,887 | 671 | 1,844 | 397 |
| Miami-Fort Lauderdale-West Palm Beach [FL] | 4,673 | 811 | 727 | 305 |
| Atlanta-Sandy Springs-Roswell [GA] | 4,144 | 724 | 402 | 186 |
| San Francisco-Oakland-Hayward [CA] | 3,961 | 543 | 325 | 124 |
| Chicago-Naperville-Elgin [IL-IN] | 3,943 | 565 | 577 | 179 |
| Harrisburg-Carlisle [PA] | 3,439 | 484 | 911 | 243 |
| Washington-Arlington-Alexandria [DC-VA-MD-WV] | 3,265 | 435 | 243 | 119 |
| Houston-The Woodlands-Sugar Land [TX] | 3,078 | 639 | 219 | 120 |
| Riverside-San Bernardino-Ontario [CA] | 2,841 | 458 | 516 | 143 |
| Boston-Cambridge-Newton [MA-NH] | 2,818 | 518 | 317 | 184 |
| Rochester [NY] | 2,664 | 481 | 1,008 | 277 |
| Grand Rapids-Wyoming [MI] | 2,302 | 390 | 430 | 142 |
| Seattle-Tacoma-Bellevue [WA] | 2,269 | 455 | 302 | 118 |
| San Diego-Carlsbad [CA] | 2,145 | 379 | 195 | 97 |
| Dallas-Fort Worth-Arlington [TX] | 1,895 | 389 | 141 | 76 |
| Allentown-Bethlehem-Easton [PA-NJ] | 1,821 | 316 | 424 | 143 |
| Orlando-Kissimmee-Sanford [FL] | 1,750 | 398 | 150 | 104 |
| Phoenix-Mesa-Scottsdale [AZ] | 1,704 | 313 | 226 | 102 |
| Tampa-St. Petersburg-Clearwater [FL] | 1,657 | 384 | 113 | 69 |
| San Jose-Sunnyvale-Santa Clara [CA] | 1,622 | 310 | 116 | 77 |
| Sacramento-Roseville-Arden-Arcade [CA] | 1,577 | 366 | 161 | 95 |
| Portland-Vancouver-Hillsboro [OR-WA] | 1,516 | 295 | 147 | 66 |
| Columbus [OH] | 1,511 | 426 | 456 | 218 |
| New York-Newark-Jersey City [NY-NJ-PA] | 1,311 | 295 | 125 | 100 |
| Detroit-Warren-Dearborn [MI] | 1,309 | 313 | 308 | 130 |
| Denver-Aurora-Lakewood [CO] | 1,242 | 276 | 90 | 55 |
| Minneapolis-St. Paul-Bloomington [MN-WI] | 1,170 | 246 | 142 | 59 |
| Baltimore-Columbia-Towson [MD] | 1,099 | 284 | 34 | 29 |
| Pittsburgh [PA] | 1,053 | 274 | 254 | 112 |
| Salt Lake City [UT] | 1,031 | 230 | 193 | 96 |
| Bridgeport-Stamford-Norwalk [CT] | 1,015 | 301 | 92 | 77 |
| St. Louis [MO-IL] | 859 | 240 | 71 | 68 |
| Indianapolis-Carmel-Anderson [IN] | 822 | 299 | 155 | 131 |
| Raleigh [NC] | 792 | 289 | 29 | 36 |
| Las Vegas-Henderson-Paradise [NV] | 777 | 173 | 155 | 97 |
| Charlotte-Concord-Gastonia [NC-SC] | 754 | 233 | 63 | 51 |
| Milwaukee-Waukesha-West Allis [WI] | 740 | 244 | 64 | 66 |
| Madison [WI] | 728 | 227 | 161 | 59 |
| Jacksonville [FL] | 714 | 260 | 63 | 46 |
| Cincinnati [OH-KY-IN] | 688 | 198 | 59 | 42 |
| Austin-Round Rock [TX] | 643 | 181 | 73 | 48 |
| Nashville-Davidson-Murfreesboro-Franklin [TN] | 599 | 245 | 34 | 43 |
| Kansas City [MO-KS] | 577 | 135 | 98 | 48 |
| Oxnard-Thousand Oaks-Ventura [CA] | 574 | 152 | 46 | 33 |
| Richmond [VA] | 521 | 196 | 22 | 26 |
| Durham-Chapel Hill [NC] | 507 | 332 | (B) | - |
| Akron [OH] | 497 | 197 | 82 | 74 |
| Santa Maria-Santa Barbara [CA] | 477 | 155 | 26 | 29 |
| Tucson [AZ] | 445 | 200 | (B) | - |
| Albany-Schenectady-Troy [NY] | 443 | 164 | 77 | 60 |
| Syracuse [NY] | 439 | 288 | 181 | 215 |
| Santa Rosa [CA] | 427 | 207 | 93 | 92 |
| Fresno [CA] | 426 | 152 | 43 | 36 |
| Worcester [MA-CT] | 401 | 179 | 8 | 13 |
| San Antonio-New Braunfels [TX] | 400 | 183 | 12 | 16 |
| Louisville Jefferson County [KY] | 395 | 154 | 4 | 7 |
| Memphis [TN-MS-AR] | 388 | 233 | (B) | - |
| Cape Coral-Fort Myers [FL] | 385 | 145 | 95 | 80 |
| Hartford-West Hartford-East Hartford [CT] | 374 | 130 | 6 | 11 |
| Dayton [OH] | 363 | 118 | 57 | 45 |
| Virginia Beach-Norfolk-Newport News [VA-NC] | 358 | 136 | 35 | 37 |
| New Haven-Milford [CT] | 345 | 165 | 72 | 63 |
| Deltona-Daytona Beach-Ormond Beach [FL] | 342 | 193 | 89 | 67 |
| Albuquerque [NM] | 336 | 121 | 17 | 21 |
| Providence-Warwick [RI-MA] | 326 | 124 | 65 | 61 |
| Stockton-Lodi [CA] | 326 | 131 | 40 | 44 |
| Spokane-Spokane Valley [WA] | 283 | 160 | 17 | 20 |
| Urban Honolulu [HI] | 270 | 129 | 15 | 17 |
| Colorado Springs [CO] | 252 | 102 | 24 | 34 |
| Portland-South Portland [ME] | 239 | 128 | 22 | 21 |
| Hilo [HI] | 236 | 81 | 9 | 10 |
| Modesto [CA] | 225 | 92 | 48 | 38 |
| New Orleans-Metairie [LA] | 220 | 128 | (B) | - |
| Springfield [MA] | 220 | 106 | 7 | 12 |
| Oklahoma City [OK] | 214 | 122 | 22 | 26 |
| Tulsa [OK] | 199 | 145 | (B) | - |
| Greensboro-High Point [NC] | 198 | 99 | 50 | 54 |
| Vallejo-Fairfield [CA] | 196 | 130 | 33 | 40 |
| Lansing-East Lansing [MI] | 189 | 71 | 80 | 52 |
| Trenton [NJ] | 189 | 110 | 24 | 30 |
| Reno [NV] | 188 | 106 | 13 | 23 |
| Anchorage [AK] | 182 | 76 | (B) | - |
| Salinas [CA] | 175 | 113 | 19 | 17 |
| Buffalo-Cheektowaga-Niagara Falls [NY] | 171 | 84 | 9 | 16 |
| Ann Arbor [MI] | 170 | 75 | 22 | 31 |
| Omaha-Council Bluffs [NE-IA] | 157 | 83 | 14 | 22 |
| Atlantic City-Hammonton [NJ] | 133 | 169 | (B) | - |
| Naples-Immokalee-Marco Island [FL] | 130 | 67 | 6 | 10 |
| Bakersfield [CA] | 127 | 78 | 8 | 14 |
| Manchester-Nashua [NH] | 124 | 66 | 33 | 39 |
| Baton Rouge [LA] | 123 | 136 | 8 | 12 |
| Des Moines-West Des Moines [IA] | 85 | 50 | 29 | 22 |
| Farmington [NM] | 55 | 70 | (B) | - |
| Kahului-Wailuku-Lahaina [HI] | 39 | 34 | (B) | - |