Orkin's annual survey of the "rattiest" US cities was released a few days ago. It makes interesting reading.
Orkin released its Top 50 Rattiest Cities list today, and for the fifth consecutive time, Chicago takes the top spot. New to the Top 10 cities this year are Minneapolis and Atlanta, holding the eighth and tenth spots, respectively.
Orkin ranked metro regions by the number of new rodent treatments performed from September 15, 2018 – September 15, 2019. This ranking includes both residential and commercial treatments.
2. Los Angeles
3. New York
4. Washington, DC (Hagerstown)
5. San Francisco-Oakland-San Jose
7. Cleveland-Akron (Canton) (+1)
8. Minneapolis-St. Paul (+3)
9. Philadelphia (-2)
10. Atlanta (+5)
There's more at the link. Click over there to see if your city is mentioned, and if so, at what rank.
This is a useful piece of information, and potentially important for your safety. In the event of any major disruption caused by weather, or natural disaster (earthquake, volcano, whatever), or social disturbance, the rat is a major disease vector. If you live in or near any of the cities listed, you should expect problems with that, and equip yourself with the necessary means to keep rats and mice under control in or near your residence.
Third World residents are used to doing that, of course, but in the First World we've largely forgotten the risks posed by rodents. Think of the Black Death bubonic plague outbreak in the 14th century, just for a start. Spread by rats and the fleas they carried, it killed up to half of the population in some parts of Europe.