48846 is a postalcode and its consensus geometry is derived from uszcta.
{"mz:is_ceased":0,"geom:latitude":42.987052,"wof:name":"48846","counts:names_total":0,"wof:placetype":"postalcode","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633793,"county_id":102083143,"localadmin_id":404507575,"locality_id":85951727,"postalcode_id":554724597,"region_id":85688599}],"mz:is_deprecated":0,"lbl:latitude":42.986125,"geom:area":0.031209,"geom:longitude":-85.057541,"wof:id":554724597,"counts:concordances_total":1,"geom:type":"Polygon","wof:lastmodified":1611183759,"wof:belongsto":[102191575,85633793,102083143,404507575,85951727,85688599],"wof:concordances":{"gp:id":"12779039"},"wof:repo":"whosonfirst-data-postalcode-us","src:geom":"uszcta","wof:country":"US","counts:names_preferred":0,"gp:parent_id":"12588747","geom:area_square_m":2.82297020018422E8,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"US","counts:names_languages":0,"geom:bbox":"-85.174356,42.878991,-84.94117,43.105408","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-85.057887,"wof:geomhash":"56ae145b492e94cdff3a16e19a3b1695","wof:parent_id":85951727,"wof:placetype_names":["postalcode"],"mz:hierarchy_label":1,"wof:placetype_id":470996387,"edtf:cessation":"uuuu","mz:postal_locality":"Ionia"}