- Laughing Gull (juvenile). Marion County, Iowa. 03 September 2018.
- An immaculately fresh juvenile.
- Little Gull (juvenile). Lake County, Indiana. 03 September 2018.
- Black-legged Kittiwake (juvenile). Ozaukee County, Wisconsin. 07 September 2018.
- Black-headed Gull (1st cycle). Suffolk County, Massachusetts. 07 September 2018.
- Little Gull (juvenile). Cook County, Illinois. 10 September 2018.
- Great Black-backed Gull (adult type). Keith County, Nebraska. 12 September 2018.
- Black-legged Kittiwake (adult). Gallatin County, Montana. 12 September 2018.
- A rarely-seen adult bird. Only the 7th for the state and earliest fall record by two months.
- Little Gull (juvenile). Washington County, Colorado. 13 September 2018.
- Sabine's Gull (juvenile). Marion County, West Virginia. 14 September 2018.
- Only the 4th state record.
- Black-tailed Gull (3rd cycle type). Powell River District, British Columbia. 13 September 2018.
- Slaty-backed Gull (adult). Pierce County, Washington. 14 September 2018.
- Likely the same adult returning here since 2013.
- Glaucous Gull (2nd cycle). St. John's County, Newfoundland. 15 September 2018.
- Slaty-backed Gull (adult type). Metro Vancouver District, British Columbia. 16 September 2018.
- California Gull (adult). Lorain County, Ohio. 13 September 2018.
- Heermann's Gull (2nd cycle type). Pima County, Arizona. 18 September 2018.
- Mew Gull (adult). Larimer County, Colorado. 19 September 2018.
- Franklin's Gull (adult). Halifax County, Nova Scotia. 19 September 2018.
- Black-headed Gull (1st cycle). District of Columbia. 22 September 2018.
- First record for Washington DC since 1989.
- Lesser Black-backed Gull (3rd cycle type). Wasco County, Oregon. 24 September 2018.
- First county record.
- Black-legged Kittiwake (adult type). Peace River District, British Columbia. 24 September 2018.
- Laughing Gull (2nd cycle). Randolph County, Missouri. 26 September 2018.
30 September 2018
Monthly Notables September 2018
Sightings: