Franklin County, MO -- suburban or rural?

[MarkD]

Evidence that it is suburban:
Population 104,682
Long treated as part of the St. Louis Metropolitan Area https://statisticalatlas.com/metro-area/Missouri/St-Louis/Overview

Evidence that it is rural:
Interstate 44 has a maximum speed limit of 70 mph all of the way through the county, and for most of the distance it has only two lanes each direction
The combined population of the five largest cities -- Washington, Union, Pacific, Sullivan, and St. Clair -- is less than half of the entire county, so there are far more Franklin County residents living in rural areas than in cities

[MarkD]

Giving this thread a bump again because I thought of another reason to call Franklin County rural: probably the most popular tourist attraction in the county is Meramec Caverns, in the south-central part of the county, near the small town of Stanton. Stanton is located pretty much in between St. Clair and Sullivan. Furthermore, in between St. Clair and Stanton there is a highway rest area, which is unusual for most suburban areas.

I was thinking today about these things because today I spent a great deal of time in Franklin County because of my job. About 9 months ago I started working as a delivery driver for an auto parts warehouse, and I have delivered to several auto repair shops and auto dealers in Franklin County several times in these 9 months. Today, I had a total of 86 auto parts to deliver to 19 repair shops/dealerships in the truck that I drove, and I delivered 39 of those parts to 10 places in Franklin County. It was on a delivery route like the one I did today that I previously thought of asking this question.