I just found this Swallow ancestor tonight, so I'm not sure if I'm experienced enough to be telling you anything new. Here are all census references I found to Wormley:
1830 in Athens Township, Harrison Co., Ohio
1850 in Bokes Creek Township, Logan Co., Ohio
1860 in Bokes Creek Township, Logan Co., Ohio
1870 in Zanesfield Township, Logan Co., Ohio
1880 in Lake Township (north precinct), Logan Co., Ohio
(after that I don't know)
I was able to browse these census images and in most cases find Wormley in census indexes by using the following three websites:
ancestry.com (census image option)
familysearch.org (1880 census only, but free)
heritagequestonline.com (all census images, and also indexes for 1870, 1910, soon 1900, etc.). This website is by subscription, although it's free if your local public library subscribes to it. You just need to call your local library to get proxy sign-on instructions.
I'm researching a descendant of Wormley & Harriet's son James, who farmed in Ohio, became a cattle broker in Illinois, and moved to Atchison City, Kansas by 1880.
Could you confirm for me Wormley's parents? You wrote in this message that they were Zachariah Swallow and Mary Greene, but in another posting on the same day, you state that Zachariah married a Susannah around 1800. Clarification?
If I find out more about Wormley, like his death date and place, I will pass it on to you.
With gratitude for a research buddy, yours truly,