This article states the world is about 50% urban now, and around 2050 the world will be about 70% urban.
In California, I think of it like this:
In my county, we only have one ex-urban (extra urban) city. In that city, about 2/3 of it is urban and the rest rural or suburban. That urban population in that city is about 20,000 population. The other 25,000 people are in suburban tracts or on rural plots. Now, the rest of the county is all rural. The county has 265,000 population.
Now, if we look at Los Angeles that has roughly 4 million people. The city is not all urban. The city's central part is urban in built form, yet the surrounding neighborhoods are suburban and rural in built form. All though, the whole city is urban. About 6 million people out of 10 million are living in an urban enviroment in that county.
So, even if you live in a rural or suburbanish part of an urban city then u are still in an urban enviroment.