Last official estimated population of Westmoreland County was 365,063 (year 2014)[1]. This was 0.114% of total US population and 2.9% of total Pennsylvania state population. Area of Westmoreland County is 1,036.1 mi² (=2683.4 km²), in this year population density was 352.35 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Westmoreland County population in 2025 would be 364,772 [0].
Historical population of Westmoreland 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] +3.56 %/yr
[1800-1810] +1.51 %/yr
[1810-1820] +1.47 %/yr
[1820-1830] +2.32 %/yr
[1830-1840] +1.07 %/yr
[1840-1850] +1.94 %/yr
[1850-1860] +0.38 %/yr
[1860-1870] +0.89 %/yr
[1870-1880] +2.88 %/yr
[1880-1890] +3.75 %/yr
[1890-1900] +3.57 %/yr
[1900-1910] +3.74 %/yr
[1910-1920] +1.69 %/yr
[1920-1930] +0.76 %/yr
[1930-1940] +0.28 %/yr
[1940-1950] +0.32 %/yr
[1950-1960] +1.19 %/yr
[1960-1970] +0.67 %/yr
[1970-1980] +0.4 %/yr
[1980-1990] -0.57 %/yr
[1990-2000] -0.01 %/yr
[2000-2005] -0.17 %/yr
[2005-2010] -0.1 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Westmoreland County? Visit this page: Settlements in Westmoreland County, PA
Population of Westmoreland County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 8546 | 7982 | 16,528 |
| 5 to 9 | 9354 | 9084 | 18,438 |
| 10 to 14 | 10083 | 9677 | 19,760 |
| 15 to 19 | 10936 | 10089 | 21,025 |
| 20 to 24 | 10573 | 9841 | 20,414 |
| 25 to 29 | 9229 | 8687 | 17,916 |
| 30 to 34 | 9473 | 9281 | 18,754 |
| 35 to 39 | 9118 | 9062 | 18,180 |
| 40 to 44 | 11026 | 11076 | 22,102 |
| 45 to 49 | 12638 | 12882 | 25,520 |
| 50 to 54 | 14026 | 14700 | 28,726 |
| 55 to 59 | 15088 | 15450 | 30,538 |
| 60 to 64 | 13243 | 13937 | 27,180 |
| 65 to 69 | 10772 | 11966 | 22,738 |
| 70 to 74 | 7882 | 9177 | 17,059 |
| 75 to 79 | 5549 | 7298 | 12,847 |
| 80 to 84 | 4062 | 6203 | 10,265 |
| 85+ | 3763 | 7567 | 11,330 |
Westmoreland 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 | 173378 | 182078 | 355,456 |
| WAC | 168797 | 177837 | 346,634 |
| NHWAC | 167027 | 176161 | 343,188 |
| WA | 166357 | 175496 | 341,853 |
| NHWA | 164723 | 173951 | 338,674 |
| BAC | 6468 | 5790 | 12,258 |
| NHBAC | 6230 | 5557 | 11,787 |
| BA | 4751 | 4116 | 8,867 |
| NHBA | 4614 | 3983 | 8,597 |
| TOM | 2548 | 2455 | 5,003 |
| NHTOM | 2405 | 2316 | 4,721 |
| AAC | 1910 | 2118 | 4,028 |
| NHAAC | 1877 | 2087 | 3,964 |
| H | 1983 | 1881 | 3,864 |
| HWAC | 1770 | 1676 | 3,446 |
| HWA | 1634 | 1545 | 3,179 |
| AA | 1441 | 1661 | 3,102 |
| NHAA | 1425 | 1646 | 3,071 |
| IAC | 743 | 727 | 1,470 |
| NHIAC | 660 | 645 | 1,305 |
| HBAC | 238 | 233 | 471 |
| IA | 222 | 193 | 415 |
| NHIA | 174 | 147 | 321 |
| HTOM | 143 | 139 | 282 |
| HBA | 137 | 133 | 270 |
| NAC | 118 | 95 | 213 |
| NHNAC | 107 | 91 | 198 |
| HIAC | 83 | 82 | 165 |
| HIA | 48 | 46 | 94 |
| NA | 42 | 38 | 80 |
| NHNA | 37 | 35 | 72 |
| HAAC | 33 | 31 | 64 |
| HAA | 16 | 15 | 31 |
| HNAC | 11 | 4 | 15 |
| HNA | 5 | 3 | 8 |
• Allegheny County population
29.2 mi, 
292°
• Washington County
42.1 mi, 
259°
• Butler County
47.9 mi, 
330°
• Beaver County
53.1 mi, 
299°
• Cambria County
42.1 mi, 
70°
• Fayette County
28.6 mi, 
198°
• Indiana County
30.8 mi, 
40°
• Somerset County
32.5 mi, 
134°
• Armstrong County
34.6 mi, 
0°
• Greene County
51.3 mi, 
231°
[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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