| Parish | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Winn Parish | 1 | 10.47% | 15,156 | 13,720 |
| Livingston Parish | 2 | 9.87% | 156,927 | 142,833 |
| Lafayette Parish | 3 | 7.87% | 261,224 | 242,176 |
| Ascension Parish | 4 | 7.25% | 136,183 | 126,975 |
| Tangipahoa Parish | 5 | 6.78% | 142,709 | 133,651 |
| West Baton Rouge Parish | 6 | 6.25% | 28,969 | 27,265 |
| Jackson Parish | 7 | 6.13% | 15,915 | 14,996 |
| St. Tammany Parish | 8 | 5.87% | 280,551 | 264,989 |
| St. Bernard Parish | 9 | 4.66% | 45,901 | 43,858 |
| Bossier Parish | 10 | 3.05% | 132,566 | 128,647 |
| De Soto Parish | 11 | 2.4% | 27,483 | 26,840 |
| LaSalle Parish | 12 | 2.16% | 15,144 | 14,824 |
| Vermilion Parish | 13 | 1.37% | 57,737 | 56,959 |
| East Baton Rouge Parish | 14 | 0.5% | 458,188 | 455,907 |
| Lincoln Parish | 15 | 0.39% | 48,488 | 48,301 |
| Beauregard Parish | 16 | 0.28% | 36,708 | 36,605 |
| Allen Parish | 17 | -0.27% | 22,610 | 22,671 |
| Grant Parish | 18 | -0.54% | 22,031 | 22,150 |
| Acadia Parish | 19 | -0.91% | 56,961 | 57,484 |
| Sabine Parish | 20 | -1.04% | 21,866 | 22,096 |
| Evangeline Parish | 21 | -1.1% | 31,946 | 32,301 |
| Ouachita Parish | 22 | -1.1% | 158,338 | 160,106 |
| West Feliciana Parish | 23 | -1.14% | 15,071 | 15,245 |
| St. Martin Parish | 24 | -1.37% | 50,911 | 51,616 |
| Washington Parish | 25 | -1.37% | 44,736 | 45,358 |
| St. Helena Parish | 26 | -1.54% | 10,716 | 10,884 |
| Lafourche Parish | 27 | -1.95% | 95,518 | 97,421 |
| Iberville Parish | 28 | -2.01% | 29,467 | 30,070 |
| Jefferson Parish | 29 | -2.11% | 430,392 | 439,688 |
| St. Landry Parish | 30 | -2.22% | 80,482 | 82,306 |
| Jefferson Davis Parish | 31 | -2.55% | 31,415 | 32,237 |
| Richland Parish | 32 | -2.65% | 19,498 | 20,029 |
| Rapides Parish | 33 | -2.95% | 125,830 | 129,655 |
| Calcasieu Parish | 34 | -3.03% | 209,905 | 216,474 |
| East Feliciana Parish | 35 | -3.16% | 18,833 | 19,447 |
| Union Parish | 36 | -3.49% | 20,361 | 21,097 |
| Caldwell Parish | 37 | -3.74% | 9,256 | 9,616 |
| Natchitoches Parish | 38 | -3.76% | 35,993 | 37,400 |
| St. Charles Parish | 39 | -3.81% | 50,514 | 52,515 |
| Franklin Parish | 40 | -4.33% | 18,861 | 19,714 |
| Terrebonne Parish | 41 | -4.76% | 104,211 | 109,415 |
| Avoyelles Parish | 42 | -5.29% | 37,549 | 39,645 |
| Concordia Parish | 43 | -5.38% | 17,574 | 18,574 |
| Iberia Parish | 44 | -5.62% | 66,119 | 70,054 |
| Bienville Parish | 45 | -5.78% | 12,169 | 12,916 |
| Plaquemines Parish | 46 | -5.85% | 22,127 | 23,503 |
| Caddo Parish | 47 | -5.86% | 223,135 | 237,024 |
| Orleans Parish | 48 | -5.88% | 360,831 | 383,361 |
| Webster Parish | 49 | -5.93% | 34,697 | 36,884 |
| St. John the Baptist Parish | 50 | -6.08% | 39,785 | 42,362 |
| St. Mary Parish | 51 | -6.14% | 46,131 | 49,149 |
| West Carroll Parish | 52 | -6.58% | 9,056 | 9,694 |
| Red River Parish | 53 | -6.59% | 7,083 | 7,583 |
| Claiborne Parish | 54 | -6.66% | 13,169 | 14,108 |
| St. James Parish | 55 | -6.73% | 18,764 | 20,117 |
| Pointe Coupee Parish | 56 | -7.25% | 19,177 | 20,676 |
| Assumption Parish | 57 | -7.36% | 19,420 | 20,962 |
| Morehouse Parish | 58 | -7.74% | 23,488 | 25,459 |
| Catahoula Parish | 59 | -8.66% | 8,080 | 8,846 |
| Vernon Parish | 60 | -9.31% | 44,103 | 48,632 |
| East Carroll Parish | 61 | -10.58% | 6,615 | 7,398 |
| Tensas Parish | 62 | -12.78% | 3,582 | 4,107 |
| Madison Parish | 63 | -13.26% | 8,612 | 9,929 |
| Cameron Parish | 64 | -17.04% | 4,663 | 5,621 |
Louisiana's parishes show varied growth patterns from 2020 to 2026. Winn Parish leads with 1.67% annualized growth, followed by Livingston Parish (1.58%) and Lafayette Parish (1.27%). The largest parishes are East Baton Rouge Parish (458,188), Jefferson Parish (430,392), and Orleans Parish (360,831). Of the 64 parishes in Louisiana, 16 are growing while 48 have experienced population decline. Overall, parishes averaged -0.44% annualized growth, with total population growing by -0.11% annually.
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