Last official estimated population of Montgomery County was 801,066 (year 2014)[1]. This was 0.251% of total US population and 6.3% of total Pennsylvania state population. Area of Montgomery County is 487.2 mi² (=1261.8 km²), in this year population density was 1,644.23 p/mi². If population growth rate would be same as in period 2010-2014 (+0.04%/yr), Montgomery County population in 2025 would be 804,353 [0].
Historical population of Montgomery 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] +0.52 %/yr
[1800-1810] +2.09 %/yr
[1810-1820] +1.88 %/yr
[1820-1830] +0.97 %/yr
[1830-1840] +1.83 %/yr
[1840-1850] +2.12 %/yr
[1850-1860] +1.92 %/yr
[1860-1870] +1.47 %/yr
[1870-1880] +1.69 %/yr
[1880-1890] +2.48 %/yr
[1890-1900] +1.21 %/yr
[1900-1910] +2.01 %/yr
[1910-1920] +1.63 %/yr
[1920-1930] +2.92 %/yr
[1930-1940] +0.85 %/yr
[1940-1950] +2.01 %/yr
[1950-1960] +3.88 %/yr
[1960-1970] +1.9 %/yr
[1970-1980] +0.31 %/yr
[1980-1990] +0.52 %/yr
[1990-2000] +1 %/yr
[2000-2005] +0.79 %/yr
[2005-2010] +0.52 %/yr
[2010-2014] +0.04 %/yr
Looking for settlements in Montgomery County? Visit this page: Settlements in Montgomery County, PA
Population of Montgomery County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 23526 | 22287 | 45,813 |
| 5 to 9 | 25599 | 24119 | 49,718 |
| 10 to 14 | 26308 | 25553 | 51,861 |
| 15 to 19 | 26291 | 25608 | 51,899 |
| 20 to 24 | 23020 | 22912 | 45,932 |
| 25 to 29 | 24887 | 24555 | 49,442 |
| 30 to 34 | 26519 | 25852 | 52,371 |
| 35 to 39 | 24289 | 24879 | 49,168 |
| 40 to 44 | 26537 | 26969 | 53,506 |
| 45 to 49 | 28574 | 29673 | 58,247 |
| 50 to 54 | 30792 | 32838 | 63,630 |
| 55 to 59 | 29615 | 31191 | 60,806 |
| 60 to 64 | 24209 | 26408 | 50,617 |
| 65 to 69 | 19109 | 21512 | 40,621 |
| 70 to 74 | 13472 | 16230 | 29,702 |
| 75 to 79 | 9468 | 12688 | 22,156 |
| 80 to 84 | 7330 | 11029 | 18,359 |
| 85+ | 7615 | 15394 | 23,009 |
Montgomery 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 | 376729 | 401247 | 777,976 |
| WAC | 328650 | 347034 | 675,684 |
| WA | 321651 | 339683 | 661,334 |
| NHWAC | 311023 | 331298 | 642,321 |
| NHWA | 304946 | 324806 | 629,752 |
| BAC | 42125 | 44337 | 86,462 |
| NHBAC | 39531 | 41767 | 81,298 |
| BA | 37632 | 39492 | 77,124 |
| NHBA | 35766 | 37623 | 73,389 |
| AAC | 31825 | 34212 | 66,037 |
| NHAAC | 31341 | 33791 | 65,132 |
| AA | 29087 | 31365 | 60,452 |
| NHAA | 28812 | 31125 | 59,937 |
| H | 20431 | 18450 | 38,881 |
| HWAC | 17627 | 15736 | 33,363 |
| HWA | 16705 | 14877 | 31,582 |
| TOM | 7679 | 8117 | 15,796 |
| NHTOM | 6652 | 7167 | 13,819 |
| HBAC | 2594 | 2570 | 5,164 |
| IAC | 2444 | 2566 | 5,010 |
| HBA | 1866 | 1869 | 3,735 |
| NHIAC | 1657 | 1834 | 3,491 |
| HTOM | 1027 | 950 | 1,977 |
| IA | 846 | 797 | 1,643 |
| HIAC | 787 | 732 | 1,519 |
| NAC | 506 | 485 | 991 |
| HAAC | 484 | 421 | 905 |
| HIA | 446 | 422 | 868 |
| NHIA | 400 | 375 | 775 |
| NHNAC | 345 | 353 | 698 |
| HAA | 275 | 240 | 515 |
| NA | 265 | 243 | 508 |
| NHNA | 153 | 151 | 304 |
| HNAC | 161 | 132 | 293 |
| HNA | 112 | 92 | 204 |
• Philadelphia County population
18.7 mi, 
137°
• Bucks County
16.4 mi, 
57°
• Delaware County
20.3 mi, 
184°
• Camden County
35.5 mi, 142°
• Chester County
25.9 mi, 
230°
• Berks County
32.5 mi, 
295°
• Mercer County
35.5 mi, 
81°
• Lehigh County
30.2 mi, 
337°
• Gloucester County
35.7 mi, 
160°
• Hunterdon County
34.4 mi, 
44°
[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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