The median income of St. Mary Parish residents was $25,255 per year, adjusted for inflation. It had 19,856 households with a population of 50,968.
The county with the highest median resident income in the state was Ascension Parish with $37,330 per year after adjusting for inflation – $12,075 more than St. Mary Parish. It had 43,032 households with a population of 123,114.
The county with the lowest median resident income in the state was Tensas Parish with $15,723 per year after adjusting for inflation – $9,532 less than St. Mary Parish. It had 1,792 households with a population of 4,561.
Louisiana counties by earnings per resident (2019)
| Rank | County | Earnings per resident |
|---|---|---|
| 1 | Ascension Parish | $37,330 |
| 2 | St. Charles Parish | $36,001 |
| 3 | West Baton Rouge Parish | $32,875 |
| 4 | St. Tammany Parish | $31,566 |
| 5 | Livingston Parish | $31,434 |
| 6 | West Feliciana Parish | $30,783 |
| 7 | Cameron Parish | $30,517 |
| 8 | Jefferson Parish | $29,735 |
| 9 | Lafayette Parish | $29,443 |
| 10 | Bossier Parish | $29,338 |
| 11 | Plaquemines Parish | $28,697 |
| 12 | East Baton Rouge Parish | $28,441 |
| 13 | St. John the Baptist Parish | $27,932 |
| 14 | Lafourche Parish | $27,296 |
| 15 | Calcasieu Parish | $27,057 |
| 16 | Vermilion Parish | $26,353 |
| 17 | St. James Parish | $26,341 |
| 18 | East Feliciana Parish | $26,177 |
| 19 | Vernon Parish | $26,098 |
| 20 | Orleans Parish | $26,095 |
| 21 | Beauregard Parish | $25,940 |
| 22 | Terrebonne Parish | $25,850 |
| 23 | De Soto Parish | $25,566 |
| 24 | Rapides Parish | $25,418 |
| 25 | St. Martin Parish | $25,297 |
| 26 | St. Mary Parish | $25,255 |
| 27 | Iberville Parish | $25,164 |
| 28 | Pointe Coupee Parish | $24,851 |
| 29 | Ouachita Parish | $24,755 |
| 30 | Assumption Parish | $24,504 |
| 31 | Iberia Parish | $24,423 |
| 32 | St. Bernard Parish | $24,209 |
| 33 | Union Parish | $24,154 |
| 34 | Tangipahoa Parish | $23,823 |
| 35 | Catahoula Parish | $23,795 |
| 36 | Caddo Parish | $23,699 |
| 37 | Acadia Parish | $22,795 |
| 38 | Jefferson Davis Parish | $22,566 |
| 39 | St. Helena Parish | $22,444 |
| 40 | Allen Parish | $22,405 |
| 41 | LaSalle Parish | $21,949 |
| 42 | Avoyelles Parish | $21,711 |
| 43 | Jackson Parish | $21,417 |
| 44 | Winn Parish | $21,224 |
| 45 | Sabine Parish | $20,945 |
| 46 | West Carroll Parish | $20,905 |
| 47 | St. Landry Parish | $20,843 |
| 48 | Bienville Parish | $20,695 |
| 49 | Caldwell Parish | $20,612 |
| 50 | Franklin Parish | $20,588 |
| 51 | Concordia Parish | $20,415 |
| 52 | Morehouse Parish | $20,371 |
| 53 | Grant Parish | $20,236 |
| 54 | Lincoln Parish | $20,228 |
| 55 | Richland Parish | $20,158 |
| 56 | Washington Parish | $19,978 |
| 57 | Evangeline Parish | $19,039 |
| 58 | Red River Parish | $18,209 |
| 59 | Natchitoches Parish | $18,151 |
| 60 | Madison Parish | $18,095 |
| 61 | East Carroll Parish | $17,979 |
| 62 | Webster Parish | $17,267 |
| 63 | Claiborne Parish | $16,244 |
| 64 | Tensas Parish | $15,723 |
* All values are inflation-adjusted
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