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Place
- Idaho3
- Illinois3
- Imp Lake Bog1
- In Brookhaven Nat. Lab.1
- Independence Lake1
- Indian Lake, along Johnny Mack BK circa 4 miles east of Blue Mountain Lake1
- Indiana21
- Ingham4
- Ionia1
- Iosco1
- Iowa5
- Ipswich River, Danvers1
- Iredell2
- Iron10
- Iron Bridge, Carp Creek, near Univ. of Michigan Biol. Station1
- Isanti2
- Island Lake1
- Itasca17
- Ithaca1