How to Build Nonprofit Lead Lists Using Free IRS 990 Data via Public API

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Every US nonprofit above a minimal size is required to file a Form 990 with the IRS, making their revenue, expenses, and assets publicly accessible. Developers and sales teams can query this data for free through ProPublica's Nonprofit Explorer API, which requires no registration or API key. The API returns key financial fields including total revenue, expenses, and end-of-year assets, enabling users to filter organizations by revenue band and assess multi-year financial trends. Filtering by a minimum revenue threshold — such as $1 million — can replicate much of what paid sector databases like GuideStar/Candid Pro offer at around $2,000 per year. The author has packaged this workflow into a commercial Apify actor that automates search, deduplication, 990 enrichment, and revenue-band filtering at $0.01 per organization row.

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