Petroleum County Historical Marital Status Data
ACS 2010-2014 data
Total population: 489
| Petroleum County | % | Montana | U.S. | |
| 15 Years and Over Total | 424 | see rank | 820,596 | 252,974,135 |
| Males, 15 Years and Over | 222 | 100%, see rank | 410,501 | 123,281,364 |
| Never Married | 47 | 21.17%, see rank | 31.55% | 35.77% |
| Married | 134 | 60.36%, see rank | 53.86% | 52.04% |
| Widowed | 3 | 1.35%, see rank | 2.72% | 2.57% |
| Divorced | 38 | 17.12%, see rank | 11.87% | 9.62% |
| Females, 15 Years and Over | 202 | 100%, see rank | 410,095 | 129,692,771 |
| Never Married | 28 | 13.86%, see rank | 24.30% | 29.48% |
| Married | 136 | 67.33%, see rank | 53.13% | 49.19% |
| Widowed | 23 | 11.39%, see rank | 9.51% | 9.16% |
| Divorced | 15 | 7.43%, see rank | 13.07% | 12.16% |
ACS 2008-2012 data
Total population: 566
| Petroleum County | % | Montana | U.S. | |
| 15 Years and Over Total | 464 | see rank | 806,822 | 248,042,237 |
| Males, 15 Years and Over | 232 | 100%, see rank | 402,826 | 120,789,875 |
| Never Married | 34 | 14.66%, see rank | 31.16% | 35.08% |
| Married | 163 | 70.26%, see rank | 54.69% | 52.93% |
| Widowed | 4 | 1.72%, see rank | 2.52% | 2.53% |
| Divorced | 31 | 13.36%, see rank | 11.63% | 9.46% |
| Females, 15 Years and Over | 232 | 100%, see rank | 403,996 | 127,252,362 |
| Never Married | 44 | 18.97%, see rank | 23.43% | 28.74% |
| Married | 150 | 64.66%, see rank | 54.28% | 49.95% |
| Widowed | 31 | 13.36%, see rank | 9.67% | 9.34% |
| Divorced | 7 | 3.02%, see rank | 12.62% | 11.97% |
ACS 2006-2010 data
Total population: 598
| Petroleum County | % | Montana | U.S. | |
| 15 Years and Over Total | 470 | see rank | 791,961 | 243,073,468 |
| Males, 15 Years and Over | 279 | 100%, see rank | 394,477 | 118,264,295 |
| Never Married | 47 | 16.85%, see rank | 29.93% | 34.21% |
| Married | 195 | 69.89%, see rank | 56.10% | 54.02% |
| Widowed | 12 | 4.30%, see rank | 2.41% | 2.52% |
| Divorced | 25 | 8.96%, see rank | 11.55% | 9.25% |
| Females, 15 Years and Over | 191 | 100%, see rank | 397,484 | 124,809,173 |
| Never Married | 16 | 8.38%, see rank | 23.00% | 27.93% |
| Married | 150 | 78.53%, see rank | 55.51% | 50.85% |
| Widowed | 24 | 12.57%, see rank | 9.50% | 9.55% |
| Divorced | 1 | 0.52%, see rank | 11.99% | 11.66% |
ACS 2005-2009 data
Total population: 512
| Petroleum County | % | Montana | U.S. | |
| 15 Years and Over Total | 406 | see rank | 777,965 | 240,146,935 |
| Males, 15 Years and Over | 222 | 100%, see rank | 386,200 | 117,166,601 |
| Never Married | 52 | 23.42%, see rank | 32.02% | 34.13% |
| Married | 136 | 61.26%, see rank | 53.54% | 54.15% |
| Widowed | 9 | 4.05%, see rank | 2.60% | 2.53% |
| Divorced | 25 | 11.26%, see rank | 11.84% | 9.19% |
| Females, 15 Years and Over | 184 | 100%, see rank | 391,765 | 122,980,334 |
| Never Married | 11 | 5.98%, see rank | 24.38% | 27.67% |
| Married | 132 | 71.74%, see rank | 53.29% | 50.88% |
| Widowed | 41 | 22.28%, see rank | 9.86% | 9.85% |
| Divorced | 0 | 0.00%, see rank | 12.47% | 11.60% |
US Census 2000 data
Total population: 493
| Petroleum County | % | Montana | U.S. | |
| 15 Years and Over Total | 387 | see rank | 715,915 | 221,148,671 |
| Males, 15 Years and Over | 203 | 100%, see rank | 353,801 | 107,027,405 |
| Never Married | 49 | 24.14%, see rank | 27.67% | 30.26% |
| Married | 124 | 61.08%, see rank | 59.49% | 58.58% |
| Widowed | 7 | 3.45%, see rank | 2.60% | 2.52% |
| Divorced | 23 | 11.33%, see rank | 10.24% | 8.65% |
| Females, 15 Years and Over | 184 | 100%, see rank | 362,114 | 114,121,266 |
| Never Married | 21 | 11.41%, see rank | 20.39% | 24.13% |
| Married | 124 | 67.39%, see rank | 57.69% | 54.60% |
| Widowed | 21 | 11.41%, see rank | 10.37% | 10.49% |
| Divorced | 18 | 9.78%, see rank | 11.55% | 10.78% |
* ACS stands for U.S. Census American Community Survey. According to the U.S. Census, if the date is a range, you can interpret the data as an average of the period of time.