Nomis is the authoritative free source. UKDataAPI makes it postcode-queryable with scoring — one call instead of navigating a 1990s-era data portal.
ONS Nomis is the official portal for UK labour market and census statistics, maintained by the Office for National Statistics. It's free, authoritative, and comprehensive — the definitive source for employment rates, earnings data, claimant counts, and Census 2021 results. But Nomis is designed for statisticians, not developers. Its interface requires selecting geographies, variables, and time periods through a multi-step web wizard. There's a basic API, but it returns data in obscure formats with geography codes that need manual mapping. UKDataAPI's Demographics endpoint wraps the same ONS data into a postcode-queryable API that returns Census 2021 population data, IMD deprivation indices, and labour market statistics — enriched with a proprietary Spending Power Index — in a single call. For developers, it replaces hours of Nomis navigation with one API request.
| Feature | UKDataAPI | ONS Nomis |
|---|---|---|
| Census 2021 population data | Postcode-level via LSOA mapping | Full Census at all geography levels |
| Labour market statistics | Median earnings, employment rate, claimant count | ✓Comprehensive labour market datasets |
| IMD deprivation indices | ✓Full rank, decile, and 7 domain scores | Not directly on Nomis (separate DLUHC dataset) |
| Spending Power Index | ✓0-100 composite score with factor breakdown | No equivalent scoring |
| Postcode-level queries | ✓Enter a postcode, get demographic data | Requires geography code lookups |
| Time series data | Latest available snapshot | ✓Full historical time series |
| Custom cross-tabulations | Pre-configured demographic profile | ✓Build your own tables from any variables |
| Output format | ✓Structured JSON API | CSV, Excel, API (complex query syntax) |
| Batch processing | ✓Up to 500 req/min | Manual downloads, basic API with limits |
| Data freshness | Regular updates from ONS releases | ✓Authoritative source — always first |
| Cost | From £0.005/call (200 free credits/month) | ✓Free — taxpayer funded |
| AI agent access (MCP/x402) | ✓Native support | Not available |
UKDataAPI
From £0.005/call (summary) to £0.025/call (full). Pay-as-you-go. Free tier: 200 credits/month.
ONS Nomis
Free. Fully open data under the Open Government Licence. No authentication required.
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://www.ukdatapi.com/api/v1/demographics/SW1A%201AA?depth=standard" # Returns: Census 2021 data, IMD deprivation indices, # labour market stats, Spending Power Index (0-100) # Cost: 12 credits (£0.025)
200 free credits. No contract. No credit card.
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