Reference

All functions
download_zip_data()	Download updated data files needed for library functionality to the package's data directory. To be implemented for future updates.
geocode_zip()	Returns that lat / lon pair of the centroid of a given ZIP code
get_cd()	Get all congressional districts for a given ZIP code
get_tracts()	Get all Census tracts within a given ZIP code
is_zcta()	Returns true if the given ZIP code is also a ZIP code tabulation area (ZCTA)
normalize_zip()	Normalize ZIP codes
reverse_zipcode()	Given a ZIP code, returns columns of metadata about that ZIP code
search_cd()	Get all ZIP codes that fall within a given congressional district
search_city()	Search ZIP codes for a given city within a state
search_county()	Search ZIP codes for a county
search_fips()	Returns all ZIP codes found within a given FIPS code
search_radius()	Search for ZIP codes that are within a given radius from a point
search_state()	Search for ZIP codes located within a given state
search_tz()	Search all ZIP codes located within a given timezone
zcta_crosswalk	ZCTA to Census Tract (2010) Crosswalk
zip_code_db	ZIP Code Database
zip_distance()	Calculate the distance between two ZIP codes in miles
zip_to_cd	ZIP Code to Congressional District Relationship File