http://www.weldcounty150.org/HistoryofWeldCountyTowns/Dearfield.html
...In 1920, Dearfield farmers produced the colonys largest crop, one third more than in the previous year.
By 1921, sixty to seventy families lived in Dearfield. Its net worth that year was appraised at $1,075,000.
In 1921, fifteen thousand of the communitys 20,000 total farm acres were under cultivation and the growing town added two churches and a gas station.
Grain, both Wheat and Corn (seen here), were Dearfields Most Important Cash Crops. Photo Source: Denver Public Library.
Many Dearfield colonists came from Denver, others from as far away as Missouri, Texas, Arkansas, Georgia, Massachusetts, and Virginia.
Aside from farming, people worked in retail businesses and truck gardening.
Hosting week-end dances for visitors from Denver were important social occasions and a source of revenue for Dearfield community members.
Many people from Denvers African-American community would travel to Dearfield on those week-ends by car and by train, there being a train station only a mile and a half away at another nearby small community. ....


I think you are right about that building--apparently Dearfield residents used the post office from the next town over:
