In 1980? Not much different to today. The population then was 125k, today it is about 175k.
However I still take issue with the original argument of:
> just in case anyone was falling for the romantic falsehood this line was selling.
I don't think it's misrepresented anything. The original comment in the article is:
>Narashino, a small town in the largely rural Chiba Prefecture
Whatever it's population density is, 175k people is still a small town.