Last official estimated population of Montgomery County was 975,934 (year 2014)[1]. This was 0.306% of total US population and 16.2% of total Maryland state population. Area of Montgomery County is 506.9 mi² (=1312.9 km²), in this year population density was 1,925.28 p/mi². If population growth rate would be same as in period 2010-2014 (+0.11%/yr), Montgomery County population in 2025 would be 987,458 [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] -1.77 %/yr
[1800-1810] +1.79 %/yr
[1810-1820] -0.92 %/yr
[1820-1830] +1.91 %/yr
[1830-1840] -2.45 %/yr
[1840-1850] +0.26 %/yr
[1850-1860] +1.45 %/yr
[1860-1870] +1.16 %/yr
[1870-1880] +1.87 %/yr
[1880-1890] +0.94 %/yr
[1890-1900] +1.14 %/yr
[1900-1910] +0.53 %/yr
[1910-1920] +0.85 %/yr
[1920-1930] +3.49 %/yr
[1930-1940] +5.48 %/yr
[1940-1950] +6.96 %/yr
[1950-1960] +7.57 %/yr
[1960-1970] +4.37 %/yr
[1970-1980] +1.03 %/yr
[1980-1990] +2.8 %/yr
[1990-2000] +1.37 %/yr
[2000-2005] +1.07 %/yr
[2005-2010] +1.07 %/yr
[2010-2014] +0.11 %/yr
Looking for settlements in Montgomery County? Visit this page: Settlements in Montgomery County, MD
Population of Montgomery County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 34467 | 32859 | 67,326 |
| 5 to 9 | 34200 | 33386 | 67,586 |
| 10 to 14 | 34177 | 33099 | 67,276 |
| 15 to 19 | 32442 | 30524 | 62,966 |
| 20 to 24 | 29971 | 28160 | 58,131 |
| 25 to 29 | 32886 | 34066 | 66,952 |
| 30 to 34 | 35164 | 36922 | 72,086 |
| 35 to 39 | 34283 | 36760 | 71,043 |
| 40 to 44 | 34770 | 37824 | 72,594 |
| 45 to 49 | 34865 | 38998 | 73,863 |
| 50 to 54 | 36690 | 40570 | 77,260 |
| 55 to 59 | 34349 | 38044 | 72,393 |
| 60 to 64 | 28145 | 31941 | 60,086 |
| 65 to 69 | 21503 | 25198 | 46,701 |
| 70 to 74 | 14380 | 17669 | 32,049 |
| 75 to 79 | 9687 | 12835 | 22,522 |
| 80 to 84 | 6994 | 10242 | 17,236 |
| 85+ | 7488 | 14889 | 22,377 |
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 | 399355 | 438215 | 837,570 |
| WAC | 326403 | 340594 | 666,997 |
| WA | 312330 | 326109 | 638,439 |
| NHWAC | 240485 | 256355 | 496,840 |
| NHWA | 229309 | 244817 | 474,126 |
| BAC | 97510 | 112114 | 209,624 |
| BA | 90098 | 103792 | 193,890 |
| H | 97106 | 95771 | 192,877 |
| NHBAC | 89218 | 103150 | 192,368 |
| NHBA | 83510 | 96667 | 180,177 |
| AAC | 81796 | 91313 | 173,109 |
| HWAC | 85918 | 84239 | 170,157 |
| NHAAC | 79666 | 89060 | 168,726 |
| HWA | 83021 | 81292 | 164,313 |
| AA | 73745 | 83227 | 156,972 |
| NHAA | 72643 | 82031 | 154,674 |
| TOM | 16085 | 16856 | 32,941 |
| NHTOM | 12851 | 13528 | 26,379 |
| HBAC | 8292 | 8964 | 17,256 |
| IAC | 7222 | 7400 | 14,622 |
| HBA | 6588 | 7125 | 13,713 |
| HIAC | 4124 | 3849 | 7,973 |
| IA | 3718 | 3525 | 7,243 |
| NHIAC | 3098 | 3551 | 6,649 |
| HTOM | 3234 | 3328 | 6,562 |
| HIA | 2892 | 2591 | 5,483 |
| HAAC | 2130 | 2253 | 4,383 |
| NAC | 1215 | 1295 | 2,510 |
| HAA | 1102 | 1196 | 2,298 |
| NHIA | 826 | 934 | 1,760 |
| NHNAC | 790 | 910 | 1,700 |
| NA | 485 | 477 | 962 |
| HNAC | 425 | 385 | 810 |
| HNA | 269 | 239 | 508 |
| NHNA | 216 | 238 | 454 |
• Fairfax County population
21.6 mi, 
190°
• District of Columbia
19 mi, 
148°
• Loudoun County
23.7 mi, 
260°
• Howard County
16.9 mi, 
61°
• Frederick County
25.3 mi, 
335°
• Arlington County
18.7 mi, 
162°
• Alexandria city
22.8 mi, 163°
• Fairfax city
20.3 mi, 194°
• Manassas Park city
28.7 mi, 
207°
• Falls Church city
17.5 mi, 
175°
[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
See note 1 Maryland Notes
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