UDS MapperThe UDS Mapper allows users to access "estimates of the collective service area of these health centers by ZCTA, including the ratio of HCP grantee and look-alike patients reported in the Uniform Data System (UDS) to the target population, the change in the number of those reported patients over time, and an estimate of those in the target population that remain unserved by HCP grantees and look-alikes reporting data to the UDS". It is not intended to cover all bases, so it is "meant to be only one of many important resources available for exploring the extent of health centers", as stated on their website.