| County Name | Population | State | Rank |
|---|---|---|---|
| East Baton Rouge Parish | 440,171 | Louisiana | 1 |
| Jefferson Parish | 432,552 | Louisiana | 2 |
| Orleans Parish | 343,829 | Louisiana | 3 |
| Caddo Parish | 254,969 | Louisiana | 4 |
| St. Tammany Parish | 233,740 | Louisiana | 5 |
| Lafayette Parish | 221,578 | Louisiana | 6 |
| Calcasieu Parish | 192,768 | Louisiana | 7 |
| Ouachita Parish | 153,720 | Louisiana | 8 |
| Rapides Parish | 131,613 | Louisiana | 9 |
| Livingston Parish | 128,026 | Louisiana | 10 |
| Tangipahoa Parish | 121,097 | Louisiana | 11 |
| Bossier Parish | 116,979 | Louisiana | 12 |
| Terrebonne Parish | 111,860 | Louisiana | 13 |
| Ascension Parish | 107,215 | Louisiana | 14 |
| Lafourche Parish | 96,318 | Louisiana | 15 |
| St. Landry Parish | 83,384 | Louisiana | 16 |
| Iberia Parish | 73,240 | Louisiana | 17 |
| Acadia Parish | 61,773 | Louisiana | 18 |
| Vermilion Parish | 57,999 | Louisiana | 19 |
| St. Mary Parish | 54,650 | Louisiana | 20 |
| St. Charles Parish | 52,780 | Louisiana | 21 |
| Vernon Parish | 52,334 | Louisiana | 22 |
| St. Martin Parish | 52,160 | Louisiana | 23 |
| Washington Parish | 47,168 | Louisiana | 24 |
| Lincoln Parish | 46,735 | Louisiana | 25 |
| St. John The Baptist Parish | 45,924 | Louisiana | 26 |
| Avoyelles Parish | 42,073 | Louisiana | 27 |
| Webster Parish | 41,207 | Louisiana | 28 |
| Natchitoches Parish | 39,566 | Louisiana | 29 |
| St. Bernard Parish | 35,897 | Louisiana | 30 |
| Beauregard Parish | 35,654 | Louisiana | 31 |
| Evangeline Parish | 33,984 | Louisiana | 32 |
| Iberville Parish | 33,387 | Louisiana | 33 |
| Jefferson Davis Parish | 31,594 | Louisiana | 34 |
| Morehouse Parish | 27,979 | Louisiana | 35 |
| De Soto Parish | 26,656 | Louisiana | 36 |
| Allen Parish | 25,764 | Louisiana | 37 |
| Sabine Parish | 24,233 | Louisiana | 38 |
| West Baton Rouge Parish | 23,788 | Louisiana | 39 |
| Assumption Parish | 23,421 | Louisiana | 40 |
| Plaquemines Parish | 23,042 | Louisiana | 41 |
| Pointe Coupee Parish | 22,802 | Louisiana | 42 |
| Union Parish | 22,721 | Louisiana | 43 |
| Grant Parish | 22,309 | Louisiana | 44 |
| St. James Parish | 22,102 | Louisiana | 45 |
| Concordia Parish | 20,822 | Louisiana | 46 |
| Franklin Parish | 20,767 | Louisiana | 47 |
| Richland Parish | 20,725 | Louisiana | 48 |
| East Feliciana Parish | 20,267 | Louisiana | 49 |
| Claiborne Parish | 17,195 | Louisiana | 50 |
| Jackson Parish | 16,274 | Louisiana | 51 |
| West Feliciana Parish | 15,625 | Louisiana | 52 |
| Winn Parish | 15,313 | Louisiana | 53 |
| La Salle Parish | 14,890 | Louisiana | 54 |
| Bienville Parish | 14,353 | Louisiana | 55 |
| Madison Parish | 12,093 | Louisiana | 56 |
| West Carroll Parish | 11,604 | Louisiana | 57 |
| St. Helena Parish | 11,203 | Louisiana | 58 |
| Catahoula Parish | 10,407 | Louisiana | 59 |
| Caldwell Parish | 10,132 | Louisiana | 60 |
| Red River Parish | 9,091 | Louisiana | 61 |
| East Carroll Parish | 7,759 | Louisiana | 62 |
| Cameron Parish | 6,839 | Louisiana | 63 |
| Tensas Parish | 5,252 | Louisiana | 64 |