Harrow is a county and its consensus geometry is derived from os.
{"name:heb_x_preferred":["הארו"],"geom:latitude":51.597723,"wof:coterminous":[1158857263],"wof:name":"Harrow","counts:names_total":12,"name:ceb_x_preferred":["Harrow"],"os:wof_type":"E - London Borough","os:area_description":"London Borough","mz:is_current":1,"wof:hierarchy":[{"continent_id":102191581,"country_id":85633159,"county_id":1880771837,"empire_id":136253055,"macrocounty_id":1880762179,"macroregion_id":404227469,"region_id":1880762729}],"name:ara_x_preferred":["هارو"],"os:name":"Harrow London Boro","mz:min_zoom":11,"lbl:latitude":51.592386,"name:por_x_preferred":["Harrow"],"geom:area":0.006549,"label:eng_x_preferred_placetype":["london borough"],"mz:is_funky":0,"counts:concordances_total":2,"geom:type":"Polygon","wof:lastmodified":1700726051,"gbr-datalondon:GSS_CODE":"E09000015","wof:belongsto":[1880762729,102191581,85633159,1880762179,404227469,136253055],"mps:latitude":51.592386,"wof:repo":"whosonfirst-data-admin-gb","wof:country":"GB","counts:names_preferred":12,"geom:area_square_m":5.030184433915E7,"name:swe_x_preferred":["Harrow"],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"GB","name:ukr_x_preferred":["Герроу"],"geom:bbox":"-0.404004,51.553085,-0.267113,51.640536","name:spa_x_preferred":["Harrow"],"name:eng_x_preferred":["Harrow"],"name:hin_x_preferred":["हैरो"],"src:lbl_centroid":"mapshaper","wof:superseded_by":[],"name:nld_x_preferred":["Harrow"],"wof:geomhash":"0c189394cbef2c91071cbab7881010f6","wof:placetype_id":102312313,"mz:is_ceased":0,"label:eng_x_preferred_longname":["Harrow London Boro"],"lbl:max_zoom":13,"wof:placetype":"county","mz:max_zoom":18,"os:census_code":"E09000015","reversegeo:latitude":51.592405,"mz:is_deprecated":0,"geom:longitude":-0.341248,"wof:id":1880771837,"wof:concordances":{"digitalenvoy:region_code":25429,"os:census_code":"E09000015"},"src:geom":"os","gbr-datalondon:ONS_INNER":"F","name:pol_x_preferred":["Harrow"],"wof:tags":[],"counts:names_languages":12,"mps:longitude":-0.353698,"reversegeo:longitude":-0.353688,"wof:supersedes":[],"lbl:longitude":-0.353698,"mz:is_landuse_aoi":0,"wof:parent_id":1880762179,"wof:placetype_names":["county"],"mz:hierarchy_label":0,"edtf:cessation":"uuuu","name:deu_x_preferred":["Harrow"]}