Data sources and methods

6-digit postal codes

The 66,817 rows (2,942 distinct codes) come from the postal code listings this site has published since 2017. They were extracted from those pages, cleaned (spelling of names, duplicate rows) and checked for format: every code has exactly 6 digits, and codes that don't match their state's usual first digit are flagged rather than corrected. The listings were last updated between 19 Jul 2017 and 19 Sept 2022. Each page shows the date of its own listing.

The codes have not been re-checked against NIPOST since those dates. NIPOST still uses the 6-digit codes, and there is no official table that converts them to the new 11-character postcodes.

States and LGAs

State and LGA names follow the OCHA/HDX Common Operational Dataset for Nigeria's administrative boundaries (COD-AB Nigeria; sources OSGOF, eHealth Africa and UN Cartographic Section), licensed CC BY-IGO. Where an old listing named a town instead of an LGA, we keep the town as a group and say the LGA isn't confirmed.

Map positions

Approximate positions of areas and towns come from GeoNames (licensed CC BY 4.0), matched by name within the right state. They're used for "nearby" lists and the near-me tool, and are area centres, not addresses. We don't use Google Maps or NIPOST data for this.

Some old Lagos listings named only "Lagos" instead of an LGA. For 33 of those 48 areas we placed the area in its LGA using cited evidence: the area's location in OpenStreetMap (© OpenStreetMap contributors, ODbL) checked against the official LGA boundaries, the LGA's Wikipedia article, or other streets that share the same postcode. Each of those pages says which method was used. The other 15 areas stay grouped under "Lagos" until we find evidence.

The new postcode

NIPOST's terms prohibit harvesting or compiling its new building postcodes. This site stores none. It shows NIPOST's published format, its published examples (such as LA 01 A03 FK 01) and the 37 state prefixes NIPOST published, and links to postcode.gov.ng for lookups.

Banks, rail, elections and post offices

Bank status, SWIFT and USSD codes, rail fares and timetables, election dates and post office facts were checked against the operators' and regulators' own websites on 1 October 2026. Each page lists its sources. Branch sort codes are legacy listings, shown with their original dates.

Reader questions

FAQ entries marked "Reader question" come from questions left in the site's comments and answered by the site team. Names, emails, phone numbers and house numbers are removed.