America/Mexico_City is a timezone and its consensus geometry is derived from woedb.
{"mz:is_ceased":0,"geom:latitude":19.529737,"wof:name":"America/Mexico_City","counts:names_total":1,"wof:placetype":"timezone","gp:source":"geoplanet 7.6.0","mz:is_current":-1,"wof:hierarchy":[{"continent_id":102191575,"country_id":85633293,"timezone_id":102047357}],"mz:is_deprecated":0,"lbl:latitude":19.675076,"geom:area":64.307499,"geom:longitude":-99.02783,"wof:id":102047357,"counts:concordances_total":1,"geom:type":"MultiPolygon","wof:lastmodified":1566655624,"wof:fullname":"America/Mexico_City, Mexico","wof:belongsto":[102191575,85633293],"wof:concordances":{"gp:id":56043602},"mps:latitude":19.675076,"wof:repo":"whosonfirst-data-admin-xy","wof:lang":["eng"],"src:geom":"woedb","wof:country":"","counts:names_preferred":1,"src:geom_alt":[],"geom:area_square_m":7.488193607082777E11,"wof:tags":[],"counts:names_variant":0,"wof:breaches":[],"edtf:inception":"uuuu","iso:country":"","counts:names_languages":1,"geom:bbox":"-105.701302,14.534548,-90.371544,25.155552","name:eng_x_preferred":["America/Mexico_City"],"mps:longitude":-99.663727,"src:lbl_centroid":"mapshaper","wof:superseded_by":[],"wof:supersedes":[],"lbl:longitude":-99.663727,"wof:geomhash":"38af07855319b41bebb0c0305ae32bb8","wof:parent_id":85633293,"wof:placetype_names":["timezone"],"mz:hierarchy_label":1,"wof:placetype_id":136057795,"edtf:cessation":"uuuu"}