Last official estimated population of St. John the Baptist Parish was 45,652 (year 2014)[1]. This was 0.014% of total US population and 1% of total Louisiana state population. Area of St. John the Baptist Parish is 409.9 mi² (=1061.5 km²), in this year population density was 111.39 p/mi². If population growth rate would be same as in period 2010-2014 (-0.15%/yr), St. John the Baptist Parish population in 2026 would be 44,846 [0].
Historical population of St. John the Baptist Parish for period 1810-2014 [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

[1810-1820] +2.57 %/yr
[1820-1830] +3.95 %/yr
[1830-1840] +0.17 %/yr
[1840-1850] +2.39 %/yr
[1850-1860] +0.81 %/yr
[1860-1870] -1.58 %/yr
[1870-1880] +3.66 %/yr
[1880-1890] +1.61 %/yr
[1890-1900] +0.82 %/yr
[1900-1910] +1.52 %/yr
[1910-1920] -1.85 %/yr
[1920-1930] +1.7 %/yr
[1930-1940] +0.48 %/yr
[1940-1950] +0.06 %/yr
[1950-1960] +2.18 %/yr
[1960-1970] +2.59 %/yr
[1970-1980] +2.97 %/yr
[1980-1990] +2.28 %/yr
[1990-2000] +0.77 %/yr
[2000-2005] +0.96 %/yr
[2005-2010] +0.28 %/yr
[2010-2014] -0.15 %/yr
Looking for settlements in St. John the Baptist Parish? Visit this page: Settlements in St. John the Baptist Parish, LA
Population of St. John the Baptist Parish by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1444 | 1444 | 2,888 |
| 5 to 9 | 1554 | 1545 | 3,099 |
| 10 to 14 | 1607 | 1583 | 3,190 |
| 15 to 19 | 1436 | 1451 | 2,887 |
| 20 to 24 | 1506 | 1515 | 3,021 |
| 25 to 29 | 1460 | 1426 | 2,886 |
| 30 to 34 | 1385 | 1483 | 2,868 |
| 35 to 39 | 1289 | 1315 | 2,604 |
| 40 to 44 | 1220 | 1466 | 2,686 |
| 45 to 49 | 1396 | 1570 | 2,966 |
| 50 to 54 | 1622 | 1765 | 3,387 |
| 55 to 59 | 1591 | 1565 | 3,156 |
| 60 to 64 | 1282 | 1306 | 2,588 |
| 65 to 69 | 975 | 1059 | 2,034 |
| 70 to 74 | 643 | 781 | 1,424 |
| 75 to 79 | 445 | 499 | 944 |
| 80 to 84 | 236 | 283 | 519 |
| 85+ | 227 | 371 | 598 |
St. John the Baptist 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 | 20024 | 21351 | 41,375 |
| BAC | 11692 | 12855 | 24,547 |
| BA | 11530 | 12703 | 24,233 |
| NHBAC | 11492 | 12690 | 24,182 |
| NHBA | 11349 | 12562 | 23,911 |
| WAC | 9468 | 9347 | 18,815 |
| WA | 9242 | 9125 | 18,367 |
| NHWAC | 8399 | 8450 | 16,849 |
| NHWA | 8203 | 8266 | 16,469 |
| H | 1294 | 1076 | 2,370 |
| HWAC | 1069 | 897 | 1,966 |
| HWA | 1039 | 859 | 1,898 |
| TOM | 259 | 261 | 520 |
| AAC | 209 | 254 | 463 |
| NHTOM | 224 | 216 | 440 |
| NHAAC | 194 | 240 | 434 |
| HBAC | 200 | 165 | 365 |
| AA | 154 | 195 | 349 |
| IAC | 161 | 176 | 337 |
| NHAA | 147 | 189 | 336 |
| HBA | 181 | 141 | 322 |
| NHIAC | 115 | 134 | 249 |
| IA | 87 | 87 | 174 |
| NAC | 60 | 71 | 131 |
| NHIA | 58 | 66 | 124 |
| NHNAC | 54 | 65 | 119 |
| NA | 46 | 56 | 102 |
| NHNA | 43 | 52 | 95 |
| HIAC | 46 | 42 | 88 |
| HTOM | 35 | 45 | 80 |
| HIA | 29 | 21 | 50 |
| HAAC | 15 | 14 | 29 |
| HAA | 7 | 6 | 13 |
| HNAC | 6 | 6 | 12 |
| HNA | 3 | 4 | 7 |
• East Baton Rouge Parish population
45.4 mi,
307°
• Orleans Parish
33.6 mi,
101°
• St. Tammany Parish
36.7 mi,
60°
• Livingston Parish
24.9 mi,
324°
• Tangipahoa Parish
33.1 mi,
8°
• Ascension Parish
25.8 mi,
279°
• Lafourche Parish
45.6 mi,
173°
• St. Charles Parish
18.4 mi,
155°
• Assumption Parish
38 mi,
243°
• St. James Parish
20.3 mi,
245°
[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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