Last official estimated population of St. Mary's County was 105,740 (year 2014)[1]. This was 0.033% of total US population and 1.8% of total Maryland state population. Area of St. Mary's County is 764.3 mi² (=1979.4 km²), in this year population density was 138.36 p/mi². If population growth rate would be same as in period 2010-2014 (+0.14%/yr), St. Mary's County population in 2026 would be 107,527 [0].
Historical population of St. Mary's County for period 1790-2014 [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
[1790-1800] -1.26 %/yr
[1800-1810] -0.68 %/yr
[1810-1820] +0.14 %/yr
[1820-1830] +0.37 %/yr
[1830-1840] -0.18 %/yr
[1840-1850] +0.35 %/yr
[1850-1860] +1.05 %/yr
[1860-1870] -0.18 %/yr
[1870-1880] +1.26 %/yr
[1880-1890] -0.68 %/yr
[1890-1900] +0.83 %/yr
[1900-1910] -0.09 %/yr
[1910-1920] -0.55 %/yr
[1920-1930] -0.59 %/yr
[1930-1940] -0.38 %/yr
[1940-1950] +7.13 %/yr
[1950-1960] +2.95 %/yr
[1960-1970] +1.99 %/yr
[1970-1980] +2.37 %/yr
[1980-1990] +2.41 %/yr
[1990-2000] +1.27 %/yr
[2000-2005] +2.36 %/yr
[2005-2010] +1.65 %/yr
[2010-2014] +0.14 %/yr
Looking for settlements in St. Mary's County? Visit this page: Settlements in St. Mary's County, MD
Population of St. Mary's County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3701 | 3576 | 7,277 |
| 5 to 9 | 3999 | 3810 | 7,809 |
| 10 to 14 | 3848 | 3877 | 7,725 |
| 15 to 19 | 3826 | 3879 | 7,705 |
| 20 to 24 | 3820 | 3802 | 7,622 |
| 25 to 29 | 4046 | 3776 | 7,822 |
| 30 to 34 | 3745 | 3721 | 7,466 |
| 35 to 39 | 3235 | 3292 | 6,527 |
| 40 to 44 | 3483 | 3647 | 7,130 |
| 45 to 49 | 4092 | 4197 | 8,289 |
| 50 to 54 | 4500 | 4296 | 8,796 |
| 55 to 59 | 3695 | 3659 | 7,354 |
| 60 to 64 | 2742 | 2865 | 5,607 |
| 65 to 69 | 2223 | 2367 | 4,590 |
| 70 to 74 | 1654 | 1707 | 3,361 |
| 75 to 79 | 1077 | 1197 | 2,274 |
| 80 to 84 | 708 | 836 | 1,544 |
| 85+ | 600 | 884 | 1,484 |
St. Mary's County 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 | 52401 | 52836 | 105,237 |
| WAC | 45414 | 44955 | 90,369 |
| WA | 43902 | 43374 | 87,276 |
| NHWAC | 43198 | 42754 | 85,952 |
| NHWA | 41819 | 41300 | 83,119 |
| BAC | 8738 | 9194 | 17,932 |
| NHBAC | 8439 | 8894 | 17,333 |
| BA | 7793 | 8165 | 15,958 |
| NHBA | 7580 | 7963 | 15,543 |
| H | 2593 | 2552 | 5,145 |
| HWAC | 2216 | 2201 | 4,417 |
| AAC | 1893 | 2416 | 4,309 |
| HWA | 2083 | 2074 | 4,157 |
| NHAAC | 1802 | 2340 | 4,142 |
| TOM | 1677 | 1761 | 3,438 |
| NHTOM | 1525 | 1608 | 3,133 |
| AA | 1311 | 1812 | 3,123 |
| NHAA | 1254 | 1769 | 3,023 |
| IAC | 597 | 583 | 1,180 |
| NHIAC | 465 | 460 | 925 |
| HBAC | 299 | 300 | 599 |
| IA | 256 | 214 | 470 |
| HBA | 213 | 202 | 415 |
| NHIA | 188 | 146 | 334 |
| HTOM | 152 | 153 | 305 |
| NAC | 137 | 148 | 285 |
| HIAC | 132 | 123 | 255 |
| NHNAC | 110 | 127 | 237 |
| HAAC | 91 | 76 | 167 |
| HIA | 68 | 68 | 136 |
| NA | 55 | 62 | 117 |
| HAA | 57 | 43 | 100 |
| NHNA | 35 | 50 | 85 |
| HNAC | 27 | 21 | 48 |
| HNA | 20 | 12 | 32 |
• Charles County population
31.5 mi, 
303°
• Calvert County
20.9 mi, 
0°
• Dorchester County
29.9 mi, 
61°
• Somerset County
38.1 mi, 
105°
• King George County
34.5 mi, 
276°
• Westmoreland County
16.7 mi, 
242°
• Northumberland County
26.4 mi, 
161°
• Lancaster County
36.2 mi, 
169°
• Essex County
29.6 mi, 
229°
• Richmond County
22 mi, 
209°
[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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