Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| County | Per capita income | Median household income | Median family income | Population | Number of households |
| --- | --- | --- | --- | --- | --- |
| Rockingham | $37,422 | $77,470 | $92,835 | 295223.0 | 115033.0 |
| Hillsborough | $33,653 | $70,591 | $83,636 | 400721.0 | 155466.0 |
| New Hampshire | $32,357 | $64,664 | $78,310 | 1316470.0 | 518973.0 |
| Merrimack | $31,403 | $65,722 | $78,998 | 146445.0 | 57069.0 |
| Belknap | $29,449 | $56,921 | $67,768 | 60088.0 | 24766.0 |
| Strafford | $29,405 | $59,082 | $74,319 | 123143.0 | 47100.0 |
| Carroll | $29,194 | $50,555 | $60,530 | 47818.0 | 21052.0 |
| Grafton | $29,090 | $53,000 | $66,701 | 89118.0 | 35986.0 |
| United States | $27,915 | $52,762 | $64,293 | 308745538.0 | 116716292.0 |
| Cheshire | $27,459 | $55,241 | $69,203 | 77117.0 | 30204.0 |
| Sullivan | $27,223 | $51,678 | $63,682 | 43742.0 | 18126.0 |
| Coos | $23,580 | $41,087 | $52,676 | 33055.0 | 14171.0 |
Question:
When the county is Carroll what is the lowest population?
Answer:
47818.0