| County | Total Persons 5 and over | English Only | Other than English | Spanish spoken at home and speak English less than "very well" | ||||||
| 2000 | 2000 | % of total | Rank | 2000 | % of total | Rank | 2000 | % of total | Rank | |
| Indiana | 5,657,818 | 5,295,736 | 93.6 | NA | 362,082 | 6.4 | NA | 84,355 | 1.5 | NA |
| Adams County | 30,947 | 26,532 | 85.7 | 90 | 4,415 | 14.3 | 3 | 153 | 0.5 | 49 |
| Allen County | 306,500 | 283,447 | 92.5 | 80 | 23,053 | 7.5 | 13 | 5,367 | 1.8 | 13 |
| Bartholomew County | 66,182 | 62,650 | 94.7 | 72 | 3,532 | 5.3 | 21 | 872 | 1.3 | 20 |
| Benton County | 8,830 | 8,474 | 96.0 | 64 | 356 | 4.0 | 27 | 62 | 0.7 | 32 |
| Blackford County | 13,147 | 12,855 | 97.8 | 13 | 292 | 2.2 | 78 | 55 | 0.4 | 60 |
| Boone County | 42,722 | 41,541 | 97.2 | 31 | 1,181 | 2.8 | 60 | 98 | 0.2 | 84 |
| Brown County | 14,163 | 13,808 | 97.5 | 22 | 355 | 2.5 | 68 | 36 | 0.3 | 78 |
| Carroll County | 18,796 | 18,048 | 96.0 | 64 | 748 | 4.0 | 27 | 323 | 1.7 | 15 |
| Cass County | 38,063 | 35,265 | 92.6 | 79 | 2,798 | 7.4 | 14 | 1,186 | 3.1 | 7 |
| Clark County | 89,910 | 87,087 | 96.9 | 44 | 2,823 | 3.1 | 47 | 751 | 0.8 | 28 |
| Clay County | 24,826 | 24,417 | 98.4 | 3 | 409 | 1.6 | 89 | 79 | 0.3 | 78 |
| Clinton County | 31,414 | 28,949 | 92.2 | 81 | 2,465 | 7.8 | 12 | 1,292 | 4.1 | 2 |
| Crawford County | 10,058 | 9,890 | 98.3 | 5 | 168 | 1.7 | 87 | 23 | 0.2 | 84 |
| Daviess County | 27,556 | 23,774 | 86.3 | 89 | 3,782 | 13.7 | 4 | 448 | 1.6 | 16 |
| Dearborn County | 42,986 | 41,870 | 97.4 | 26 | 1,116 | 2.6 | 64 | 185 | 0.4 | 60 |
| Decatur County | 22,712 | 22,026 | 97.0 | 40 | 686 | 3.0 | 50 | 31 | 0.1 | 90 |
| DeKalb County | 37,225 | 36,311 | 97.5 | 22 | 914 | 2.5 | 68 | 135 | 0.4 | 60 |
| Delaware County | 111,756 | 107,865 | 96.5 | 54 | 3,891 | 3.5 | 38 | 730 | 0.7 | 32 |
| Dubois County | 36,842 | 35,040 | 95.1 | 69 | 1,802 | 4.9 | 24 | 680 | 1.8 | 13 |
| Elkhart County | 168,052 | 143,855 | 85.6 | 91 | 24,197 | 14.4 | 2 | 8,524 | 5.1 | 1 |
| Fayette County | 23,925 | 23,532 | 98.4 | 3 | 393 | 1.6 | 89 | 95 | 0.4 | 60 |
| Floyd County | 66,298 | 64,371 | 97.1 | 34 | 1,927 | 2.9 | 54 | 277 | 0.4 | 60 |
| Fountain County | 16,771 | 16,277 | 97.1 | 34 | 494 | 2.9 | 54 | 83 | 0.5 | 49 |
| Franklin County | 20,617 | 20,013 | 97.1 | 34 | 604 | 2.9 | 54 | 77 | 0.4 | 60 |
| Fulton County | 19,166 | 18,460 | 96.3 | 57 | 706 | 3.7 | 36 | 304 | 1.6 | 16 |
| Gibson County | 30,402 | 29,598 | 97.4 | 26 | 804 | 2.6 | 64 | 212 | 0.7 | 32 |
| Grant County | 68,963 | 66,272 | 96.1 | 60 | 2,691 | 3.9 | 30 | 481 | 0.7 | 32 |
| Greene County | 31,105 | 30,415 | 97.8 | 13 | 690 | 2.2 | 78 | 77 | 0.2 | 84 |
| Hamilton County | 165,990 | 156,275 | 94.1 | 74 | 9,715 | 5.9 | 18 | 1,126 | 0.7 | 32 |
| Hancock County | 51,664 | 50,099 | 97.0 | 40 | 1,565 | 3.0 | 50 | 207 | 0.4 | 60 |
| Harrison County | 32,121 | 31,340 | 97.6 | 18 | 781 | 2.4 | 72 | 193 | 0.6 | 41 |
| Hendricks County | 96,527 | 93,702 | 97.1 | 34 | 2,825 | 2.9 | 54 | 391 | 0.4 | 60 |
| Henry County | 45,532 | 44,603 | 98.0 | 10 | 929 | 2.0 | 83 | 232 | 0.5 | 49 |
| Howard County | 78,943 | 75,866 | 96.1 | 60 | 3,077 | 3.9 | 30 | 522 | 0.7 | 32 |
| Huntington County | 35,508 | 34,379 | 96.8 | 47 | 1,129 | 3.2 | 44 | 203 | 0.6 | 41 |
| Jackson County | 38,381 | 36,735 | 95.7 | 67 | 1,646 | 4.3 | 26 | 632 | 1.6 | 16 |
| Jasper County | 27,959 | 26,900 | 96.2 | 58 | 1,059 | 3.8 | 34 | 255 | 0.9 | 24 |
| Jay County | 20,188 | 19,009 | 94.2 | 73 | 1,179 | 5.8 | 20 | 203 | 1.0 | 23 |
| Jefferson County | 29,761 | 28,755 | 96.6 | 52 | 1,006 | 3.4 | 40 | 176 | 0.6 | 41 |
| Jennings County | 25,501 | 24,875 | 97.5 | 22 | 626 | 2.5 | 68 | 118 | 0.5 | 49 |
| Johnson County | 106,625 | 102,881 | 96.5 | 54 | 3,744 | 3.5 | 38 | 555 | 0.5 | 49 |
| Knox County | 36,970 | 35,800 | 96.8 | 47 | 1,170 | 3.2 | 44 | 214 | 0.6 | 41 |
| Kosciusko County | 68,606 | 62,828 | 91.6 | 83 | 5,778 | 8.4 | 10 | 1,598 | 2.3 | 9 |
| LaGrange County | 31,509 | 21,505 | 68.3 | 92 | 10,004 | 31.7 | 1 | 662 | 2.1 | 10 |
| Lake County | 450,115 | 389,523 | 86.5 | 88 | 60,592 | 13.5 | 5 | 15,091 | 3.4 | 4 |
| LaPorte County | 103,061 | 96,957 | 94.1 | 74 | 6,104 | 5.9 | 18 | 1,401 | 1.4 | 19 |
| Lawrence County | 42,948 | 42,055 | 97.9 | 11 | 893 | 2.1 | 81 | 139 | 0.3 | 78 |
| Madison County | 124,968 | 121,119 | 96.9 | 44 | 3,849 | 3.1 | 47 | 1,073 | 0.9 | 24 |
| Marion County | 796,858 | 738,672 | 92.7 | 78 | 58,186 | 7.3 | 15 | 17,057 | 2.1 | 10 |
| Marshall County | 41,833 | 37,748 | 90.2 | 86 | 4,085 | 9.8 | 7 | 1,386 | 3.3 | 5 |
| Martin County | 9,703 | 9,568 | 98.6 | 1 | 135 | 1.4 | 91 | 7 | 0.1 | 90 |
| Miami County | 33,755 | 32,546 | 96.4 | 56 | 1,209 | 3.6 | 37 | 161 | 0.5 | 49 |
| Monroe County | 114,507 | 105,258 | 91.9 | 82 | 9,249 | 8.1 | 11 | 681 | 0.6 | 41 |
| Montgomery County | 35,167 | 34,100 | 97.0 | 40 | 1,067 | 3.0 | 50 | 387 | 1.1 | 22 |
| Morgan County | 61,860 | 60,458 | 97.7 | 16 | 1,402 | 2.3 | 76 | 228 | 0.4 | 60 |
| Newton County | 13,670 | 12,993 | 95.0 | 70 | 677 | 5.0 | 23 | 169 | 1.2 | 21 |
| Noble County | 42,637 | 38,545 | 90.4 | 85 | 4,092 | 9.6 | 8 | 1,687 | 4.0 | 3 |
| Ohio County | 5,293 | 5,220 | 98.6 | 1 | 73 | 1.4 | 91 | 10 | 0.2 | 84 |
| Orange County | 18,036 | 17,441 | 96.7 | 50 | 595 | 3.3 | 42 | 106 | 0.6 | 41 |
| Owen County | 20,362 | 19,867 | 97.6 | 18 | 495 | 2.4 | 72 | 35 | 0.2 | 84 |
| Parke County | 16,297 | 15,761 | 96.7 | 50 | 536 | 3.3 | 42 | 44 | 0.3 | 78 |
| Perry County | 17,886 | 17,448 | 97.6 | 18 | 438 | 2.4 | 72 | 76 | 0.4 | 60 |
| Pike County | 12,018 | 11,807 | 98.2 | 7 | 211 | 1.8 | 85 | 38 | 0.3 | 78 |
| Porter County | 137,274 | 128,741 | 93.8 | 76 | 8,533 | 6.2 | 17 | 1,120 | 0.8 | 28 |
| Posey County | 25,327 | 24,795 | 97.9 | 11 | 532 | 2.1 | 81 | 128 | 0.5 | 49 |
| Pulaski County | 12,888 | 12,586 | 97.7 | 16 | 302 | 2.3 | 76 | 83 | 0.6 | 41 |
| Putnam County | 33,858 | 32,887 | 97.1 | 34 | 971 | 2.9 | 54 | 141 | 0.4 | 60 |
| Randolph County | 25,569 | 25,002 | 97.8 | 13 | 567 | 2.2 | 78 | 141 | 0.6 | 41 |
| Ripley County | 24,521 | 24,072 | 98.2 | 7 | 449 | 1.8 | 85 | 110 | 0.4 | 60 |
| Rush County | 16,993 | 16,507 | 97.1 | 34 | 486 | 2.9 | 54 | 12 | 0.1 | 90 |
| St. Joseph County | 246,865 | 225,726 | 91.4 | 84 | 21,139 | 8.6 | 9 | 4,627 | 1.9 | 12 |
| Scott County | 21,246 | 20,848 | 98.1 | 9 | 398 | 1.9 | 84 | 98 | 0.5 | 49 |
| Shelby County | 40,519 | 39,470 | 97.4 | 26 | 1,049 | 2.6 | 64 | 305 | 0.8 | 28 |
| Spencer County | 19,135 | 18,533 | 96.9 | 44 | 602 | 3.1 | 47 | 125 | 0.7 | 32 |
| Starke County | 22,024 | 20,901 | 94.9 | 71 | 1,123 | 5.1 | 22 | 162 | 0.7 | 32 |
| Steuben County | 31,021 | 29,658 | 95.6 | 68 | 1,363 | 4.4 | 25 | 266 | 0.9 | 24 |
| Sullivan County | 20,514 | 19,864 | 96.8 | 47 | 650 | 3.2 | 44 | 171 | 0.8 | 28 |
| Switzerland County | 8,501 | 8,246 | 97.0 | 40 | 255 | 3.0 | 50 | 18 | 0.2 | 84 |
| Tippecanoe County | 140,093 | 124,060 | 88.6 | 87 | 16,033 | 11.4 | 6 | 3,562 | 2.5 | 8 |
| Tipton County | 15,576 | 15,170 | 97.4 | 26 | 406 | 2.6 | 64 | 59 | 0.4 | 60 |
| Union County | 6,848 | 6,583 | 96.1 | 60 | 265 | 3.9 | 30 | 31 | 0.5 | 49 |
| Vanderburgh County | 161,284 | 155,085 | 96.2 | 58 | 6,199 | 3.8 | 34 | 846 | 0.5 | 49 |
| Vermillion County | 15,698 | 15,272 | 97.3 | 30 | 426 | 2.7 | 63 | 65 | 0.4 | 60 |
| Vigo County | 99,390 | 95,485 | 96.1 | 60 | 3,905 | 3.9 | 30 | 416 | 0.4 | 60 |
| Wabash County | 32,919 | 32,095 | 97.5 | 22 | 824 | 2.5 | 68 | 119 | 0.4 | 60 |
| Warren County | 7,915 | 7,779 | 98.3 | 5 | 136 | 1.7 | 87 | 31 | 0.4 | 60 |
| Warrick County | 48,933 | 47,551 | 97.2 | 31 | 1,382 | 2.8 | 60 | 259 | 0.5 | 49 |
| Washington County | 25,391 | 24,788 | 97.6 | 18 | 603 | 2.4 | 72 | 69 | 0.3 | 78 |
| Wayne County | 66,735 | 64,057 | 96.0 | 64 | 2,678 | 4.0 | 27 | 632 | 0.9 | 24 |
| Wells County | 25,756 | 24,876 | 96.6 | 52 | 880 | 3.4 | 40 | 172 | 0.7 | 32 |
| White County | 23,686 | 21,980 | 92.8 | 77 | 1,706 | 7.2 | 16 | 765 | 3.2 | 6 |
| Whitley County | 28,646 | 27,839 | 97.2 | 31 | 807 | 2.8 | 60 | 123 | 0.4 | 60 |