Last official estimated population of St. Tammany Parish was 234,576 (year 2014)[1]. This was 0.074% of total US population and 5% of total Louisiana state population. Area of St. Tammany Parish is 1,095.6 mi² (=2837.5 km²), in this year population density was 214.11 p/mi². If population growth rate would be same as in period 2010-2014 (+0.09%/yr), St. Tammany Parish population in 2026 would be 237,102 [0].
Historical population of St. Tammany Parish for period 1820-2014 [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
[1820-1830] +5.21 %/yr
[1830-1840] +4.85 %/yr
[1840-1850] +3.3 %/yr
[1850-1860] -1.62 %/yr
[1860-1870] +0.33 %/yr
[1870-1880] +2.12 %/yr
[1880-1890] +3.96 %/yr
[1890-1900] +2.76 %/yr
[1900-1910] +3.56 %/yr
[1910-1920] +0.88 %/yr
[1920-1930] +0.14 %/yr
[1930-1940] +1.22 %/yr
[1940-1950] +1.34 %/yr
[1950-1960] +3.65 %/yr
[1960-1970] +5.11 %/yr
[1970-1980] +5.72 %/yr
[1980-1990] +2.68 %/yr
[1990-2000] +2.84 %/yr
[2000-2005] +2.59 %/yr
[2005-2010] +1.46 %/yr
[2010-2014] +0.09 %/yr
Looking for settlements in St. Tammany Parish? Visit this page: Settlements in St. Tammany Parish, LA
Population of St. Tammany Parish by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 7028 | 7107 | 14,135 |
| 5 to 9 | 8657 | 8377 | 17,034 |
| 10 to 14 | 9207 | 8826 | 18,033 |
| 15 to 19 | 8597 | 7988 | 16,585 |
| 20 to 24 | 6930 | 6723 | 13,653 |
| 25 to 29 | 6443 | 6776 | 13,219 |
| 30 to 34 | 7248 | 7898 | 15,146 |
| 35 to 39 | 7474 | 7842 | 15,316 |
| 40 to 44 | 7667 | 8503 | 16,170 |
| 45 to 49 | 8268 | 8598 | 16,866 |
| 50 to 54 | 9058 | 9719 | 18,777 |
| 55 to 59 | 8792 | 9597 | 18,389 |
| 60 to 64 | 7738 | 8172 | 15,910 |
| 65 to 69 | 6247 | 6989 | 13,236 |
| 70 to 74 | 4295 | 4904 | 9,199 |
| 75 to 79 | 2741 | 3227 | 5,968 |
| 80 to 84 | 1660 | 2355 | 4,015 |
| 85+ | 1423 | 2755 | 4,178 |
St. Tammany 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 | 112684 | 119907 | 232,591 |
| WAC | 102890 | 107977 | 210,867 |
| WA | 101075 | 106059 | 207,134 |
| NHWAC | 96603 | 102069 | 198,672 |
| NHWA | 94960 | 100359 | 195,319 |
| BAC | 14980 | 16550 | 31,530 |
| NHBAC | 14655 | 16172 | 30,827 |
| BA | 13994 | 15481 | 29,475 |
| NHBA | 13757 | 15224 | 28,981 |
| H | 6789 | 6449 | 13,238 |
| HWAC | 6287 | 5908 | 12,195 |
| HWA | 6115 | 5700 | 11,815 |
| AAC | 2188 | 2491 | 4,679 |
| NHAAC | 2058 | 2341 | 4,399 |
| TOM | 2027 | 2163 | 4,190 |
| NHTOM | 1829 | 1911 | 3,740 |
| AA | 1639 | 1906 | 3,545 |
| NHAA | 1550 | 1821 | 3,371 |
| IAC | 1471 | 1555 | 3,026 |
| NHIAC | 1231 | 1287 | 2,518 |
| IA | 687 | 670 | 1,357 |
| NHIA | 551 | 542 | 1,093 |
| HBAC | 325 | 378 | 703 |
| HIAC | 240 | 268 | 508 |
| HBA | 237 | 257 | 494 |
| HTOM | 198 | 252 | 450 |
| NAC | 139 | 163 | 302 |
| HAAC | 130 | 150 | 280 |
| HIA | 136 | 128 | 264 |
| NHNAC | 102 | 115 | 217 |
| HAA | 89 | 85 | 174 |
| NA | 51 | 77 | 128 |
| NHNA | 37 | 50 | 87 |
| HNAC | 37 | 48 | 85 |
| HNA | 14 | 27 | 41 |
• Orleans Parish population
24.7 mi, 
177°
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51.8 mi, 
89°
• Livingston Parish
46.2 mi, 
272°
• Tangipahoa Parish
30.8 mi, 
298°
• Pearl River County
33.3 mi, 
40°
• St. Charles Parish
42.4 mi, 
214°
• Washington Parish
31.1 mi, 
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• St. John the Baptist Parish
36.7 mi, 
240°
• Hancock County
28 mi, 92°
• Walthall County
52.9 mi, 350°
[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
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