| Parish | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Livingston Parish | 1 | 10.27% | 157,518 | 142,846 |
| Lafayette Parish | 2 | 8.08% | 261,751 | 242,178 |
| Ascension Parish | 3 | 7.65% | 136,694 | 126,983 |
| Tangipahoa Parish | 4 | 7.35% | 143,471 | 133,642 |
| St. Tammany Parish | 5 | 6.13% | 281,243 | 265,007 |
| West Baton Rouge Parish | 6 | 4.9% | 28,599 | 27,262 |
| Bossier Parish | 7 | 2.94% | 132,546 | 128,759 |
| Vermilion Parish | 8 | 2.82% | 58,561 | 56,954 |
| St. Bernard Parish | 9 | 2.74% | 45,059 | 43,859 |
| De Soto Parish | 10 | 2.42% | 27,500 | 26,851 |
| Grant Parish | 11 | 1.43% | 22,469 | 22,153 |
| Allen Parish | 12 | 0.91% | 22,895 | 22,688 |
| St. Helena Parish | 13 | 0.38% | 10,941 | 10,900 |
| Lincoln Parish | 14 | 0.33% | 48,463 | 48,306 |
| East Baton Rouge Parish | 15 | 0.28% | 457,180 | 455,916 |
| Washington Parish | 16 | 0.03% | 45,368 | 45,354 |
| St. Martin Parish | 17 | -0.4% | 51,410 | 51,614 |
| Beauregard Parish | 18 | -0.4% | 36,461 | 36,608 |
| Ouachita Parish | 19 | -1.2% | 158,198 | 160,114 |
| Iberville Parish | 20 | -1.2% | 29,710 | 30,071 |
| Acadia Parish | 21 | -1.68% | 56,514 | 57,481 |
| LaSalle Parish | 22 | -1.69% | 14,578 | 14,829 |
| Lafourche Parish | 23 | -1.76% | 95,734 | 97,446 |
| Jefferson Parish | 24 | -2.12% | 430,445 | 439,747 |
| Calcasieu Parish | 25 | -2.24% | 211,635 | 216,493 |
| Jackson Parish | 26 | -2.26% | 14,657 | 14,996 |
| Winn Parish | 27 | -2.38% | 13,391 | 13,718 |
| Caldwell Parish | 28 | -2.51% | 9,375 | 9,616 |
| St. Landry Parish | 29 | -2.87% | 79,949 | 82,310 |
| Richland Parish | 30 | -2.94% | 19,441 | 20,030 |
| Union Parish | 31 | -2.94% | 20,479 | 21,100 |
| West Feliciana Parish | 32 | -2.96% | 14,811 | 15,262 |
| Evangeline Parish | 33 | -2.96% | 31,345 | 32,301 |
| East Feliciana Parish | 34 | -3.2% | 18,820 | 19,442 |
| Sabine Parish | 35 | -3.36% | 21,366 | 22,108 |
| Jefferson Davis Parish | 36 | -3.55% | 31,068 | 32,212 |
| Rapides Parish | 37 | -3.75% | 124,791 | 129,658 |
| Avoyelles Parish | 38 | -3.94% | 38,079 | 39,640 |
| Iberia Parish | 39 | -4.06% | 67,216 | 70,064 |
| Bienville Parish | 40 | -4.35% | 12,356 | 12,918 |
| St. Charles Parish | 41 | -4.59% | 50,106 | 52,516 |
| Franklin Parish | 42 | -4.68% | 18,791 | 19,714 |
| Terrebonne Parish | 43 | -5.39% | 103,520 | 109,413 |
| Pointe Coupee Parish | 44 | -5.46% | 19,545 | 20,674 |
| Claiborne Parish | 45 | -5.55% | 13,325 | 14,108 |
| Plaquemines Parish | 46 | -5.55% | 22,155 | 23,457 |
| West Carroll Parish | 47 | -5.62% | 9,148 | 9,693 |
| St. John the Baptist Parish | 48 | -5.92% | 39,852 | 42,359 |
| Natchitoches Parish | 49 | -5.96% | 35,164 | 37,391 |
| Assumption Parish | 50 | -6.01% | 19,704 | 20,963 |
| Webster Parish | 51 | -6.03% | 34,664 | 36,887 |
| St. James Parish | 52 | -6.09% | 18,894 | 20,119 |
| St. Mary Parish | 53 | -6.14% | 46,135 | 49,155 |
| Caddo Parish | 54 | -6.4% | 221,759 | 236,912 |
| East Carroll Parish | 55 | -6.44% | 6,918 | 7,394 |
| Concordia Parish | 56 | -6.45% | 17,373 | 18,570 |
| Tensas Parish | 57 | -6.62% | 3,836 | 4,108 |
| Orleans Parish | 58 | -6.68% | 357,769 | 383,374 |
| Vernon Parish | 59 | -7.53% | 44,963 | 48,624 |
| Morehouse Parish | 60 | -8.68% | 23,251 | 25,460 |
| Red River Parish | 61 | -8.71% | 6,924 | 7,585 |
| Catahoula Parish | 62 | -9.98% | 7,964 | 8,847 |
| Madison Parish | 63 | -11.85% | 8,743 | 9,918 |
| Cameron Parish | 64 | -20.2% | 4,488 | 5,624 |
Louisiana's parishes show varied growth patterns from 2020 to 2026. Livingston Parish leads with 1.64% annualized growth, followed by Lafayette Parish (1.3%) and Ascension Parish (1.24%). The largest parishes are East Baton Rouge Parish (457,180), Jefferson Parish (430,445), and Orleans Parish (357,769). Of the 64 parishes in Louisiana, 16 are growing while 48 have experienced population decline. Overall, parishes averaged -0.48% annualized growth, with total population growing by -0.13% annually.
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