Okome impressed the club on an initial loan at the end of last season, making nine appearances and becoming a focal point in the Dabbers' backline.
He will now team up with the club again as they continue preparations for life in the Pitching In NPL West Division.
On signing up permanently, Okome said: “It feels good. I’ve known about the club since I was 15, so I’m delighted I’ve finally got a place where I feel comfortable and I know that can progress and develop me.
"I’m hoping to kick on and get promotion."
Chairman Jon Gold said: “We’re delighted to have Nathan signed. He’s got the right attitude and an abundance of quality.
"Everyone saw when he came in last year what a difference he made. I think this is just a step in his career as I think he can play at a higher level and hopefully we can play a part in doing that, and he can play a part in helping us compete very strongly near the top of this division.
"It’s very exciting times and I think it’s a great signing for the club.”
Photo credit: Nantwich Town
Keep up-to-date with our exclusive email newsletters.
Subscribe