# Dudullu OSB

> mahalle (administrative quarter) in Ümraniye, İstanbul–Asia, northwestern Turkey

**Wikidata**: [Q109384407](https://www.wikidata.org/wiki/Q109384407)  
**Source**: https://4ort.xyz/entity/dudullu-osb


## References

1. [PTT](https://postakodu.ptt.gov.tr)
2. [Q97233662](https://www.btk.gov.tr/cografi-numaralar)
3. [Turkish Statistical Institute](https://www.tuik.gov.tr)
4. [Source](https://data.tuik.gov.tr/Bulten/Index?p=Adrese-Dayali-Nufus-Kayit-Sistemi-Sonuclari-2021-45500)
5. [Supreme Election Council. 2023](https://www.resmigazete.gov.tr/eskiler/2023/03/20230303-6.pdf)