2020 census
{| class="wikitable"
|+ Briar Creek racial composition
! Race
! Num.
! Perc.
|-
| White
| 554
| 92.8%
|-
| Black or African American
| 6
| 1.0%
|-
| Native American
| 0
| 0.0%
|-
| Asian
| 6
| 1.0%
|-
| Pacific Islander
| 0
| 0.0%
|-
| Other/Mixed
| 31
| 5.2%
|-
| Hispanic or Latino
| 21
| 3.5%
|}
As of the 2020 United States census, there were 597 people residing in the borough. The population density was , with 331 housing units at an average density of .
2010 census
As of the 2010 United States census, there were 660 people, 276 households, and 142 families residing in the borough. The population density was , with 314 housing units at an average density of . The racial makeup of the borough was 643 (97.4%) white, 2 (0.3%) African American, 1 (0.2%) Native American, 3 (0.5%) Asian, 0 (0.0%) Pacific Islander, and 11 (1.6%) of two or more races. 4 people (0.6%) of any race were Hispanic or Latino.
There were 276 households, out of which 63 (22.8%) had children under the age of 18 living with them, 97 (35.1%) were married couples living together, 33 (12.0%) had a female householder with no husband present, and 12 (4.3%) had a male householder with no wife present. There were 23 (8.3%) unmarried opposite-sex partnerships and 1 (7.6%) unmarried same-sex partnership. 134 (48.6%) households were non-families. 117 (42.4%) of all households were made up of individuals, and 85 (30.8%) had someone living alone who was 65 years of age or older. The average household size was 2.14, and the average family size was 2.94. 12 people (4.3%) lived in non-institutionalized group quarters, and 58 (21.0%) were institutionalized.
The population was spread out, with 116 people (17.6%) under the age of 18, 47 (7.1%) aged 18 to 24, 131 (19.8%) aged 25 to 44, 153 (23.2%) aged 45 to 64, and 213 (32.3%) who were 65 years of age or older. The median age was 43.9 years. For every 100 females, there were 78.4 males.
2000 census
As of the census