Demographics & People — Mountlake Terrace, Washington
Population Overview
| Population (Census) | 21,419 |
| Estimated 2026 | ~27,600 |
| Median Age | 38.3 |
| Total Households | 9,117 |
| Family Households | 5,335 |
| Average Household Size | 2.33 |
| Diversity Index | 0.5051 (moderately diverse) |
Race & Ethnicity
| White | 13,470 |
| Black or African American | 774 |
| Asian | 2,202 |
| Hispanic or Latino | 3,678 |
Heritage & Ancestry
| Group | Count |
| Other groups | 7,351 |
| Unclassified or not reported | 3,716 |
| German | 3,613 |
| Hispanic: Hispanic or Latino | 2,708 |
| English | 2,617 |
| Irish | 2,457 |
| Hispanic: Mexican | 1,958 |
| Norwegian | 1,194 |
| European | 934 |
| American | 732 |
Language
| English Only | 15,488 |
| Spanish | 2,426 |
| Population 5+ | 20,434 |
Veterans
| Veterans | 1,220 |
| Population 18+ | 17,371 |
Commuting
| Mean Commute Time | 27.9 minutes |
| Work from Home | 21.9% |
| Commuter Profile | N/A |
Source: Census ACS 5-Year 2023; Census ACS 5-Year 2023, Table B01003; Census ACS 5-Year 2023, B19013. Data for Mountlake Terrace, Washington.