Iowa puts Marion inside Linn County. The place runs to some 37,330 residents. Nearest to furthest: Cedar Lake after 4.7 miles, Robbins Lake after 5.7 miles to the west, Williams Lake after 11 miles followed by Goose Pond after 13 miles to the north-west. Robbins Lake sits low and warms quickly, so it comes on
| Issuing agency | Who needs a license | Resident annual | Non-resident annual | Non-resident short-term | Saltwater requirement | License-free days | Official source (last verified) |
|---|---|---|---|---|---|---|---|
| Iowa Department of Natural Resources (Iowa DNR) | Ages 16 and older | $22.00 | $48.00 | 1-day, 3-day, 7-day | Not applicable — no coastline | 3 days (June) | Agency pageVerified 2026-08-13 |
*Prices are base annual freshwater licenses and exclude vendor fees, stamps and endorsements. Where a cell reads “Not verified”, the agency does not publish the figure in a format we can verify automatically.
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