@openstreetmap/id-tagging-schema/data/presets/place/city.json

The OpenStreetMap tagging model used by the iD editor

{
    "icon": "maki-city",
    "fields": [
        "name",
        "population",
        "population/date",
        "source/population"
    ],
    "moreFields": [
        "{place}"
    ],
    "geometry": [
        "point",
        "area"
    ],
    "tags": {
        "place": "city"
    },
    "name": "City"
}