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11,788 U.S. government websites.

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tools.usps.com271.2M visits

Unverified availability

pmc.ncbi.nlm.nih.gov126.2M visits

pubmed.ncbi.nlm.nih.gov118.5M visits

Unverified availability

pubchem.ncbi.nlm.nih.gov68M visits

secure.login.gov50.3M visits

usps.com50M visits

va.gov42.8M visits

irs.gov40.4M visits

ncbi.nlm.nih.gov32.6M visits

Unverified availability

clinicaltrials.gov31.5M visits

ssa.gov29.4M visits

cdc.gov25.4M visits

weather.gov24.5M visits

usajobs.gov24.1M visits

catalog.archives.gov23.2M visits

studentaid.gov22.4M visits

Unverified availability

nhc.noaa.gov20.7M visits

Unverified availability

secure.ssa.gov19.7M visits

nps.gov18.5M visits

medlineplus.gov16.4M visits

travel.state.gov16.2M visits

Unverified availability

uscis.gov16.1M visits

science.nasa.gov14.6M visits

justice.gov14M visits

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