data api for demographics and firmographics

If you’re looking for a data API for demographics and firmographics, here are the main options depending on what you need:

Demographics APIs

These are useful for person-level or household-level data such as age, income, gender, location, education, etc.

• U.S. Census API

  • Free
  • Great for U.S. population, income, age, housing, and geography
  • Best for broad public demographic datasets

• Experian / TransUnion / Acxiom

  • More commercial and enrichment-focused
  • Useful for consumer demographic attributes
  • Often used in marketing, identity, and customer enrichment

• Claritas

  • Strong for segmentation and consumer profiling
  • Good for marketing and audience analytics

• FullContact

  • More identity enrichment than raw demographics
  • Can help build consumer profiles from email/contact data

Firmographics APIs

These are for company-level data such as industry, revenue, employee count, location, funding, website, etc.

• Clearbit Enrichment API

  • Very popular for company and contact enrichment
  • Returns firmographic data like industry, size, location, tech stack

• ZoomInfo

  • Strong B2B contact and company intelligence
  • Enterprise-grade, but pricing can be high

• People Data Labs

  • Offers both person and company enrichment
  • Good API coverage for firmographics and identity resolution

• Crunchbase API

  • Best for company funding, investors, leadership, and startup info
  • More startup/VC oriented than general firmographics

• Apollo API

  • B2B contact and company data
  • Often used for sales prospecting and lead enrichment

• Dun & Bradstreet

  • Classic source for company credit and business intelligence
  • Strong for firmographic and risk-related data

If you want both demographics + firmographics

A few platforms can cover both:

• People Data Labs
• Clearbit (stronger on firmographics, some person enrichment)
• ZoomInfo (enterprise B2B focus)
• Acxiom / Experian (stronger for consumer data, also business data depending on product)

Choosing the right one

• Need free public demographic data? → U.S. Census API
• Need B2B lead/company enrichment? → Clearbit, Apollo, ZoomInfo, PDL
• Need startup/funding data? → Crunchbase
• Need consumer marketing demographics? → Experian, Acxiom, Claritas
• Need company verification / risk / credit? → Dun & Bradstreet

If you want, I can also give you:

1. a comparison table,
2. API pricing/limitations, or
3. example API requests for the best providers.