This is unchanged from the previous estimate.
Allen Parish had the 39th largest population in Louisiana in 2021.
The US Census Bureau found more than 73 percent of counties in the US saw a natural decrease in population in 2021. This is up from a 55.5 percent increase in 2020.
The Midwest suffered the most sustained population decreases, with many counties along the US East Coast and through the Rocky Mountains seeing increases.
The US population continues to grow, though at a slower rate than before.
Louisiana Counties By Population Change from 2020 to 2021
| County | 2020 Estimated Population | 2021 Estimated Population | % Change in Population From Year to Year |
|---|---|---|---|
| Livingston Parish | 142,726 | 145,830 | 2.2% |
| West Baton Rouge Parish | 27,236 | 27,792 | 2% |
| St. Tammany Parish | 264,933 | 269,388 | 1.7% |
| West Feliciana Parish | 15,256 | 15,494 | 1.6% |
| Tangipahoa Parish | 133,549 | 135,217 | 1.2% |
| Ascension Parish | 126,984 | 128,369 | 1.1% |
| St. Bernard Parish | 43,838 | 44,258 | 1% |
| Lafayette Parish | 242,004 | 244,205 | 0.9% |
| Jefferson Davis Parish | 32,166 | 32,345 | 0.6% |
| Grant Parish | 22,129 | 22,236 | 0.5% |
| Bossier Parish | 128,615 | 129,144 | 0.4% |
| De Soto Parish | 26,854 | 26,919 | 0.2% |
| St. Helena Parish | 10,889 | 10,912 | 0.2% |
| Sabine Parish | 22,118 | 22,135 | 0.1% |
| Beauregard Parish | 36,573 | 36,584 | 0% |
| Lafourche Parish | 97,495 | 97,504 | 0% |
| Allen Parish | 22,697 | 22,687 | 0% |
| St. Martin Parish | 51,604 | 51,540 | -0.1% |
| Vermilion Parish | 57,289 | 57,204 | -0.1% |
| Union Parish | 21,124 | 21,091 | -0.2% |
| Lincoln Parish | 48,259 | 48,152 | -0.2% |
| St. Landry Parish | 82,273 | 82,071 | -0.2% |
| Franklin Parish | 19,721 | 19,668 | -0.3% |
| Evangeline Parish | 32,307 | 32,215 | -0.3% |
| Acadia Parish | 57,455 | 57,288 | -0.3% |
| St. Charles Parish | 52,481 | 52,282 | -0.4% |
| Caldwell Parish | 9,617 | 9,571 | -0.5% |
| Claiborne Parish | 14,109 | 14,038 | -0.5% |
| Washington Parish | 45,370 | 45,133 | -0.5% |
| Terrebonne Parish | 109,319 | 108,708 | -0.6% |
| East Baton Rouge Parish | 455,884 | 453,301 | -0.6% |
| East Feliciana Parish | 19,451 | 19,338 | -0.6% |
| Catahoula Parish | 8,859 | 8,805 | -0.6% |
| Plaquemines Parish | 23,466 | 23,303 | -0.7% |
| St. John the Baptist Parish | 42,394 | 42,094 | -0.7% |
| Red River Parish | 7,619 | 7,564 | -0.7% |
| Rapides Parish | 129,607 | 128,654 | -0.7% |
| Jackson Parish | 14,989 | 14,876 | -0.8% |
| Ouachita Parish | 160,003 | 158,768 | -0.8% |
| Natchitoches Parish | 37,349 | 37,026 | -0.9% |
| Iberville Parish | 30,095 | 29,824 | -0.9% |
| Bienville Parish | 12,899 | 12,776 | -1% |
| Avoyelles Parish | 39,616 | 39,236 | -1% |
| Richland Parish | 19,997 | 19,805 | -1% |
| West Carroll Parish | 9,694 | 9,594 | -1% |
| Iberia Parish | 69,725 | 68,975 | -1.1% |
| Vernon Parish | 48,582 | 48,027 | -1.1% |
| Concordia Parish | 18,589 | 18,376 | -1.1% |
| Madison Parish | 9,927 | 9,799 | -1.3% |
| Assumption Parish | 20,968 | 20,689 | -1.3% |
| Jefferson Parish | 439,845 | 433,688 | -1.4% |
| Morehouse Parish | 25,430 | 25,025 | -1.6% |
| Pointe Coupee Parish | 20,689 | 20,356 | -1.6% |
| Orleans Parish | 383,282 | 376,971 | -1.6% |
| Caddo Parish | 237,056 | 233,092 | -1.7% |
| Winn Parish | 13,721 | 13,488 | -1.7% |
| Tensas Parish | 4,116 | 4,043 | -1.8% |
| Webster Parish | 36,864 | 36,184 | -1.8% |
| St. Mary Parish | 49,140 | 48,232 | -1.8% |
| St. James Parish | 20,127 | 19,742 | -1.9% |
| East Carroll Parish | 7,383 | 7,220 | -2.2% |
| Calcasieu Parish | 216,416 | 205,282 | -5.1% |
| Cameron Parish | 5,619 | 5,080 | -9.6% |
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