Nishiōizumimachi
Nishiōizumimachi 
    西大泉町  | |
|---|---|
Enclave district  | |
| Coordinates: 35°45′48″N 139°34′01″E / 35.76333°N 139.56694°E | |
| Country | Japan | 
| Prefecture | Tokyo | 
| City | Nerima | 
| Population  (April 1, 2023)  | |
 • Total  | 33 | 
Nishiōizumimachi (西大泉町) is a small enclave district that belongs to Nerima, Tokyo, Japan, but is surrounded entirely by Saitama Prefecture.
Nishiōizumimachi is surrounded by Katayama 3-chōme, Niiza, Saitama, approximately 60 metres (200 ft) north of Nishi-Ōizumi 6-chome. On April 1st, 2023, there were fifteen households in this district and its population was 33 (13 male and 20 female). The area contains one small street running through the center. The entire area bears the number 1179 and individual houses are numbered 21, 23 and 25.