Historical population
| Census | Pop. | Note | %± |
| 2010 | 226 | | — |
|---|
| 2020 | 229 | | 1.3% |
|---|
The 2020 United States census reported that Trowbridge had a population of 229. The population density was 33.8 inhabitants per square mile (13.1/km2). The racial makeup of Trowbridge was 175 (76.4%) White, 3 (1.3%) African American, 0 (0.0%) Native American, 3 (1.3%) Asian, 0 (0.0%) Pacific Islander, 13 (5.7%) from other races, and 35 (15.3%) from two or more races. Hispanic or Latino of any race were 34 persons (14.8%).[7]
The whole population lived in households. There were 80 households, out of which 18 (22.5%) had children under the age of 18 living in them, 42 (52.5%) were married-couple households, 7 (8.8%) were cohabiting couple households, 27 (33.8%) had a female householder with no partner present, and 4 (5.0%) had a male householder with no partner present. 22 households (27.5%) were one person, and 13 (16.2%) were one person aged 65 or older. The average household size was 2.86.[7] There were 54 families (67.5% of all households).[8]
The age distribution was 46 people (20.1%) under the age of 18, 13 people (5.7%) aged 18 to 24, 68 people (29.7%) aged 25 to 44, 54 people (23.6%) aged 45 to 64, and 48 people (21.0%) who were 65 years of age or older. The median age was 39.2 years. There were 131 males and 98 females.[7]
There were 84 housing units at an average density of 12.4 units per square mile (4.8 units/km2), of which 80 (95.2%) were occupied. Of these, 44 (55.0%) were owner-occupied, and 36 (45.0%) were occupied by renters.[7]