Foreign residents8,090peopleNaturalized citizens 1,009 people
Foreign resident share4.74%Of registered residents
Resident types
Seosan-si ranks 5th of 15 in Chungcheongnam-do by foreign residents.
By residence type
As of September 2026Unit: %
Overseas Koreans 18.6%Other foreign nationals 44.8%Migrant workers 21.8%Marriage migrants 9.8%Foreign students 5.0%
| Type | People | Share |
|---|---|---|
| Overseas Koreans | 1,502 | 18.6% |
| Other foreign nationals | 3,623 | 44.8% |
| Migrant workers | 1,763 | 21.8% |
| Marriage migrants | 795 | 9.8% |
| Foreign students | 407 | 5% |
Other foreign nationals are the largest group at 3,623.
Age structure
By age group
As of September 2026| Age group | People | Share |
|---|---|---|
| Under 10 | 240 | 3% |
| 10s | 268 | 3.3% |
| 20s | 1,827 | 22.6% |
| 30s | 2,251 | 27.8% |
| 40s | 1,712 | 21.2% |
| 50s | 1,069 | 13.2% |
| 60s | 512 | 6.3% |
| 70+ | 211 | 2.6% |
Residents in their 30s are the largest age group at 2,251.
Frequently asked questionsβ
8,090 as of the 2026 survey, or 4.74% of its population.
Other foreign nationals form the largest group, at 3,623.
5th out of 15.
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