"A Gazatteer of Virginia and West Virginia" by Henry Gannett, originally
published in 1904, and reprinted by Clearfield Pub. Co. in 1994 says:

"Ca Ira: a post village in Cumberland Co." [no more specific location given]

"Oakforest: a post village in Cumberland Co."

I'm sorry there isn't more information but perhaps knowing the exact
spellings and the fact that both places were open ca. 1900 will help you.
Perhaps you can write to the Cumberland Co. Historical Society and ask them.
Try writing to them
c/o Mrs. Sue Seawell
P.O. Box 188
Cumberland, VA  23040-0188

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