Thank you very very much!!!
The new (for me) 1900 Census information explains a lot. Right beneath the Carlsons are the Rydstrands. Alfred Rydstrand married Blenda Swedhin, and Gustaf later married Lillian Sophia Swedhin. I'd always wondered how Gustaf and Lillian met. They were either neighbors, or they met through the Rydstrands.
It means a lot to me to finally know where my American Carlson ancestors were in 1900. I can't thank you enough.
Now the challenge is finding out how and where Carl Gustaf and his son Frans Oskar died. It was probably somewhere in that vicinity, and they're probably buried nearby. Any information and leads are greatly appreciated.
Thank you again so much for the information you've provided!