US Census Bureau PEP API
Population Estimates Program
US Census Bureau PEP API is one of 19 APIs that US Census Bureau publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
This API exposes 3 JSON Schema definitions.
Tagged areas include PEP. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, a JSON-LD context, and 3 JSON Schemas.
This API exposes 2 operations across 2 paths, and defines 1 schema. It is described by OpenAPI 3.1.0, at version 2026-05-25.
Requests are made against a single base URL, https://api.census.gov/data.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 1
US Census Bureau PEP API declares
1 security scheme
for authenticating requests.
An API key is passed in the query as key (ApiKeyQuery).
By default, every request must be authenticated.
Paths & Operations 2
Across 2 paths, the API surfaces 2 operations — 2 GET. Each is listed below with its method, path, parameters, and response codes.
Population Estimates Program
Schemas 1
The contract defines 1 schema that model the data the API accepts and returns. Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from US Census Bureau 12
Other APIs US Census Bureau publishes across the network.
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