Foreign residents18,699peopleNaturalized citizens 2,676 people
Foreign resident share7.32%Of registered residents
Resident types
Osan-si ranks 15th of 31 in Gyeonggi by foreign residents.
By residence type
As of September 2026Unit: %
Overseas Koreans 44.1%Other foreign nationals 30.8%Migrant workers 12.0%Marriage migrants 10.1%Foreign students 3.0%
| Type | People | Share |
|---|---|---|
| Overseas Koreans | 8,252 | 44.1% |
| Other foreign nationals | 5,753 | 30.8% |
| Migrant workers | 2,239 | 12% |
| Marriage migrants | 1,889 | 10.1% |
| Foreign students | 566 | 3% |
Overseas Koreans are the largest group at 8,252.
Age structure
By age group
As of September 2026| Age group | People | Share |
|---|---|---|
| Under 10 | 991 | 5.3% |
| 10s | 646 | 3.5% |
| 20s | 1,753 | 9.4% |
| 30s | 4,471 | 23.9% |
| 40s | 3,851 | 20.6% |
| 50s | 3,597 | 19.2% |
| 60s | 2,593 | 13.9% |
| 70+ | 797 | 4.3% |
Residents in their 30s are the largest age group at 4,471.
Frequently asked questionsβ
18,699 as of the 2026 survey, or 7.32% of its population.
Overseas Koreans form the largest group, at 8,252.
15th out of 31.
The 2026 edition of the annual local foreign resident survey by Korea's Ministry of the Interior and Safety. Population figures come from monthly resident registration data, so the two have different reference dates.
Sources π
- MOIS Survey of Foreign Residents by Local GovernmentKOGL Type 1 Β· 2026 survey Β· updated yearly