The major streets are the following: South Main Street, W State 50 Rd.
In term of post offices you can find 1 location in the region (like "Sylvia Post Office"). For fire stations you have 1 places with "Reno County Fire District 6 - Sylvia" for example. About town halls, 1 possibilities exist (like "Sylvia Town Hall").
Are you looking for an apartment for sale/rent? Or interested by a house? You can check that on Zillow.
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