Last official estimated population of St. Mary Parish was 54,562 (year 2014)[1]. This was 0.017% of total US population and 1.2% of total Louisiana state population. Area of St. Mary Parish is 1,119.4 mi² (=2899.3 km²), in this year population density was 48.74 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), St. Mary Parish population in 2026 would be 54,299 [0].
Historical population of St. Mary Parish for period 1830-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1830-1840] +3.34 %/yr
[1840-1850] +4.35 %/yr
[1850-1860] +2.07 %/yr
[1860-1870] -1.91 %/yr
[1870-1880] +3.68 %/yr
[1880-1890] +1.2 %/yr
[1890-1900] +4.3 %/yr
[1900-1910] +1.43 %/yr
[1910-1920] -2.44 %/yr
[1920-1930] -0.45 %/yr
[1930-1940] +0.68 %/yr
[1940-1950] +1.31 %/yr
[1950-1960] +3.14 %/yr
[1960-1970] +2.21 %/yr
[1970-1980] +0.56 %/yr
[1980-1990] -1 %/yr
[1990-2000] -0.81 %/yr
[2000-2005] -0.2 %/yr
[2005-2010] +0.61 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in St. Mary Parish? Visit this page: Settlements in St. Mary Parish, LA
Population of St. Mary Parish by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1880 | 1759 | 3,639 |
| 5 to 9 | 1820 | 1839 | 3,659 |
| 10 to 14 | 1781 | 1760 | 3,541 |
| 15 to 19 | 1713 | 1756 | 3,469 |
| 20 to 24 | 1894 | 1788 | 3,682 |
| 25 to 29 | 1814 | 1707 | 3,521 |
| 30 to 34 | 1620 | 1622 | 3,242 |
| 35 to 39 | 1522 | 1488 | 3,010 |
| 40 to 44 | 1611 | 1613 | 3,224 |
| 45 to 49 | 1700 | 1773 | 3,473 |
| 50 to 54 | 1991 | 2087 | 4,078 |
| 55 to 59 | 1970 | 1950 | 3,920 |
| 60 to 64 | 1506 | 1493 | 2,999 |
| 65 to 69 | 1196 | 1388 | 2,584 |
| 70 to 74 | 902 | 980 | 1,882 |
| 75 to 79 | 661 | 803 | 1,464 |
| 80 to 84 | 381 | 563 | 944 |
| 85+ | 283 | 548 | 831 |
St. Mary Parish resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 24208 | 25537 | 49,745 |
| WAC | 16851 | 16854 | 33,705 |
| WA | 16403 | 16418 | 32,821 |
| NHWAC | 15100 | 15706 | 30,806 |
| NHWA | 14713 | 15312 | 30,025 |
| BAC | 8561 | 9370 | 17,931 |
| NHBAC | 8369 | 9209 | 17,578 |
| BA | 8276 | 9073 | 17,349 |
| NHBA | 8118 | 8944 | 17,062 |
| H | 2037 | 1380 | 3,417 |
| HWAC | 1751 | 1148 | 2,899 |
| HWA | 1690 | 1106 | 2,796 |
| IAC | 704 | 682 | 1,386 |
| NHIAC | 599 | 599 | 1,198 |
| AAC | 605 | 498 | 1,103 |
| NHAAC | 560 | 463 | 1,023 |
| IA | 519 | 504 | 1,023 |
| TOM | 500 | 495 | 995 |
| AA | 522 | 410 | 932 |
| NHIA | 454 | 445 | 899 |
| NHAA | 489 | 385 | 874 |
| NHTOM | 428 | 442 | 870 |
| HBAC | 192 | 161 | 353 |
| HBA | 158 | 129 | 287 |
| HIAC | 105 | 83 | 188 |
| HTOM | 72 | 53 | 125 |
| HIA | 65 | 59 | 124 |
| NAC | 45 | 42 | 87 |
| HAAC | 45 | 35 | 80 |
| HAA | 33 | 25 | 58 |
| NHNAC | 21 | 31 | 52 |
| NA | 25 | 17 | 42 |
| HNAC | 24 | 11 | 35 |
| HNA | 19 | 8 | 27 |
| NHNA | 6 | 9 | 15 |
• Lafayette Parish population
53.7 mi,
317°
• Terrebonne Parish
42.5 mi,
118°
• Ascension Parish
51.8 mi,
39°
• Iberia Parish
22.8 mi,
265°
• Vermilion Parish
50.9 mi,
282°
• St. Martin Parish
35.1 mi,
345°
• Iberville Parish
44.7 mi,
7°
• West Baton Rouge Parish
58.4 mi,
9°
• Assumption Parish
30.9 mi,
52°
• St. James Parish
48.6 mi,
55°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Attakapas (St. Martin) Louisiana Notes
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