1. **State the problem:** We need to write the rate of residents per county as a unit rate. 2. **Given:** There are 193,116 residents living in 22 counties. 3. **Formula:** A unit rate is found by dividing the total quantity by the number of units. Here, we divide residents by counties: $$\text{Unit rate} = \frac{\text{Total residents}}{\text{Number of counties}}$$ 4. **Calculate:** $$\frac{193,116}{22} = 8,778$$ 5. **Interpretation:** This means there are 8,778 residents per county. 6. **Answer:** The unit rate is **8,778 residents per county**. 7. **Check the options:** - 8778 counties/resident (incorrect units) - 8778 residents/county (correct) - 1/8778 residents/county (incorrect fraction) - 1/8778 counties/resident (incorrect fraction and units)