Of special interest in Ohio (Ohio Division of Wildlife, June 2026)
Ohio's Division of Wildlife names it as one at the edge of its range in Ohio, breeding here at low numbers. It is not listed as endangered or threatened.
Near Summit County
Range
Where it is recorded
Season shown in 0 of Ohio's 88 counties. Its mapped range covers 45. Explore Ohio
No result yet (18)
Within its mapped range (22)
Recorded, too few records for a result (44)
Recorded, season not shown (4)
Season shown (0)
Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files, 1:500,000. Range: USGS Gap Analysis Project, Species Range Maps CONUS_2001 (2018). Show as a table
Counties as a table
Common Merganser by Ohio county: records and mapped range
County
Records
In mapped range
Adams County
No qualifying records yet
No
Allen County
Recorded, too few records for a result
Yes: winter
Ashland County
No qualifying records yet
Yes: winter
Ashtabula County
Recorded, too few records for a result
Yes: winter
Athens County
Recorded, too few records for a result
No
Auglaize County
No qualifying records yet
Yes: winter
Belmont County
Recorded, too few records for a result
No
Brown County
No qualifying records yet
Yes: winter
Butler County
No qualifying records yet
No
Carroll County
Recorded, too few records for a result
No
Champaign County
No qualifying records yet
Yes: winter
Clark County
No qualifying records yet
Yes: winter
Clermont County
Recorded, too few records for a result
Yes: winter
Clinton County
Recorded, too few records for a result
Yes: winter
Columbiana County
Recorded, too few records for a result
No
Coshocton County
No qualifying records yet
No
Crawford County
No qualifying records yet
Yes: winter
Cuyahoga County
89 · Recorded, season not shown
Yes: winter
Darke County
Recorded, too few records for a result
No
Defiance County
No qualifying records yet
Yes: winter
Delaware County
No qualifying records yet
No
Erie County
Recorded, too few records for a result
Yes: winter
Fairfield County
Recorded, too few records for a result
No
Fayette County
No qualifying records yet
Yes: winter
Franklin County
Recorded, too few records for a result
No
Fulton County
No qualifying records yet
Yes: winter
Gallia County
No qualifying records yet
No
Geauga County
Recorded, too few records for a result
Yes: winter
Greene County
Recorded, too few records for a result
Yes: winter
Guernsey County
No qualifying records yet
No
Hamilton County
Recorded, too few records for a result
No
Hancock County
Recorded, too few records for a result
Yes: winter
Hardin County
No qualifying records yet
Yes: winter
Harrison County
Recorded, too few records for a result
No
Henry County
No qualifying records yet
Yes: winter
Highland County
Recorded, too few records for a result
Yes: winter
Hocking County
Recorded, too few records for a result
No
Holmes County
No qualifying records yet
No
Huron County
No qualifying records yet
Yes: winter
Jackson County
No qualifying records yet
No
Jefferson County
Recorded, too few records for a result
No
Knox County
Recorded, too few records for a result
No
Lake County
36 · Recorded, season not shown
Yes: winter
Lawrence County
Recorded, too few records for a result
No
Licking County
Recorded, too few records for a result
No
Logan County
No qualifying records yet
Yes: winter
Lorain County
34 · Recorded, season not shown
Yes: winter
Lucas County
Recorded, too few records for a result
Yes: winter
Madison County
Recorded, too few records for a result
Yes: winter
Mahoning County
No qualifying records yet
No
Marion County
Recorded, too few records for a result
Yes: winter
Medina County
Recorded, too few records for a result
Yes: winter
Meigs County
No qualifying records yet
No
Mercer County
No qualifying records yet
Yes: winter
Miami County
No qualifying records yet
Yes: winter
Monroe County
Recorded, too few records for a result
No
Montgomery County
Recorded, too few records for a result
No
Morgan County
No qualifying records yet
No
Morrow County
No qualifying records yet
No
Muskingum County
Recorded, too few records for a result
No
Noble County
No qualifying records yet
No
Ottawa County
Recorded, too few records for a result
Yes: winter
Paulding County
No qualifying records yet
Yes: winter
Perry County
No qualifying records yet
No
Pickaway County
No qualifying records yet
No
Pike County
Recorded, too few records for a result
No
Portage County
Recorded, too few records for a result
No
Preble County
No qualifying records yet
No
Putnam County
No qualifying records yet
Yes: winter
Richland County
Recorded, too few records for a result
Yes: winter
Ross County
Recorded, too few records for a result
No
Sandusky County
No qualifying records yet
Yes: winter
Scioto County
No qualifying records yet
No
Seneca County
Recorded, too few records for a result
Yes: winter
Shelby County
No qualifying records yet
Yes: winter
Stark County
Recorded, too few records for a result
No
Summit County
91 · Recorded, season not shown
No
Trumbull County
Recorded, too few records for a result
Yes: winter
Tuscarawas County
Recorded, too few records for a result
No
Union County
No qualifying records yet
Yes: winter
Van Wert County
No qualifying records yet
Yes: winter
Vinton County
No qualifying records yet
No
Warren County
Recorded, too few records for a result
Yes: winter
Washington County
Recorded, too few records for a result
No
Wayne County
Recorded, too few records for a result
No
Williams County
No qualifying records yet
Yes: winter
Wood County
Recorded, too few records for a result
Yes: winter
Wyandot County
Recorded, too few records for a result
Yes: winter
Season
When it is recorded
In Summit County
Recorded all year
Recorded through most of the year, so there is no single season to show. Based on 91 records in 9 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Summit County · records of all species each week, 106,876 in all
Records per week from 91 records in 9 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
Records of Common Merganser in Summit County each week, and records of all species
Week
Records of Common Merganser
Years recorded
Records of all species
Jan 4–10
1
1
711
Jan 11–17
1
1
665
Jan 18–24
1
1
601
Jan 25–31
5
3
526
Feb 1–7
3
3
608
Feb 8–14
2
2
619
Feb 15–21
7
3
629
Feb 22–28
6
5
748
Mar 1–7
10
6
728
Mar 8–14
6
4
852
Mar 15–21
3
2
1,055
Mar 22–28
3
3
1,007
Mar 29 – Apr 4
4
4
1,005
Apr 5–11
3
1
1,654
Apr 12–18
3
2
2,454
Apr 19–25
1
1
2,699
Apr 26 – May 2
1
1
3,970
May 3–9
0
0
3,569
May 10–16
6
4
4,053
May 17–23
0
0
3,509
May 24–30
3
2
4,045
May 31 – Jun 6
0
0
2,874
Jun 7–13
0
0
3,158
Jun 14–20
1
1
3,796
Jun 21–27
0
0
3,501
Jun 28 – Jul 4
1
1
3,968
Jul 5–11
0
0
3,632
Jul 12–18
1
1
4,051
Jul 19–25
1
1
3,855
Jul 26 – Aug 1
1
1
2,908
Aug 2–8
1
1
3,828
Aug 9–15
1
1
3,583
Aug 16–22
0
0
3,535
Aug 23–29
0
0
2,939
Aug 30 – Sep 5
0
0
2,840
Sep 6–12
0
0
2,758
Sep 13–19
1
1
2,761
Sep 20–26
0
0
2,646
Sep 27 – Oct 3
1
1
2,089
Oct 4–10
6
1
2,317
Oct 11–17
1
1
1,944
Oct 18–24
2
2
1,314
Oct 25–31
0
0
1,272
Nov 1–7
0
0
786
Nov 8–14
0
0
761
Nov 15–21
0
0
654
Nov 22–28
1
1
703
Nov 29 – Dec 5
0
0
503
Dec 6–12
1
1
447
Dec 13–19
1
1
496
Dec 20–26
1
1
522
Dec 27 – Jan 2
0
0
728
In Ohio
Recorded all year
Recorded through most of the year, so there is no single season to show. Based on 590 records in 10 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
This week · Nov 8–14
JanFebMarAprMayJunJulAugSepOctNovDec
Show over the bars
Recording in Ohio · records of all species each week, 1,691,199 in all
Records per week from 590 records in 10 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
Records of Common Merganser in Ohio each week, and records of all species
Week
Records of Common Merganser
Years recorded
Records of all species
Jan 4–10
20
6
6,211
Jan 11–17
10
4
5,146
Jan 18–24
22
8
4,645
Jan 25–31
13
5
4,698
Feb 1–7
22
7
6,023
Feb 8–14
24
7
5,888
Feb 15–21
26
8
5,436
Feb 22–28
27
9
6,846
Mar 1–7
44
6
8,321
Mar 8–14
21
7
10,384
Mar 15–21
18
7
12,620
Mar 22–28
11
5
13,949
Mar 29 – Apr 4
22
8
19,661
Apr 5–11
14
4
26,860
Apr 12–18
12
5
39,925
Apr 19–25
18
5
41,623
Apr 26 – May 2
14
5
56,391
May 3–9
6
3
52,952
May 10–16
13
6
53,785
May 17–23
7
5
57,698
May 24–30
10
4
54,651
May 31 – Jun 6
9
3
53,099
Jun 7–13
8
5
53,700
Jun 14–20
7
4
56,625
Jun 21–27
4
4
55,361
Jun 28 – Jul 4
7
4
58,477
Jul 5–11
5
4
61,336
Jul 12–18
6
4
64,722
Jul 19–25
4
4
69,753
Jul 26 – Aug 1
3
3
59,416
Aug 2–8
6
4
59,712
Aug 9–15
7
5
55,994
Aug 16–22
5
3
54,328
Aug 23–29
5
4
51,772
Aug 30 – Sep 5
6
5
57,167
Sep 6–12
3
2
59,075
Sep 13–19
5
3
54,543
Sep 20–26
7
4
45,860
Sep 27 – Oct 3
13
6
43,180
Oct 4–10
20
7
37,841
Oct 11–17
17
6
30,824
Oct 18–24
3
3
21,156
Oct 25–31
2
1
19,021
Nov 1–7
4
4
14,172
Nov 8–14
4
3
12,621
Nov 15–21
5
4
7,965
Nov 22–28
6
4
8,136
Nov 29 – Dec 5
4
4
6,083
Dec 6–12
12
6
6,004
Dec 13–19
7
3
5,423
Dec 20–26
7
5
5,661
Dec 27 – Jan 2
15
8
8,459
What these results show
These results show when people recorded a species, not when or where it occurs. Missing weeks and low counts do not mean absence or scarcity, and counts are not abundance. Contributed records reflect where, when and what people chose to observe.
Red-breasted MerganserMergus serratorOften confused in Ohio: 16 identifications in Ohio named one where the other was meant
Hooded MerganserLophodytes cucullatusOften confused in Ohio: 15 identifications in Ohio named one where the other was meant
MallardAnas platyrhynchos182 identifications worldwide named one where the other was meant
Common GoldeneyeBucephala clangula152 identifications worldwide named one where the other was meant
Common LoonGavia immer92 identifications worldwide named one where the other was meant
From iNaturalist’s similar-species counts, refreshed monthly: confusions in Ohio first, then worldwide. Only species with an Ohio result are listed.
Land cover where it is recorded
Land cover
Its recordsAll Ohio records
Open water
44%3%
Developed
24%49%
Forest
19%31%
Wetland
8%5%
Farmland
3%11%
Grassland and shrub
2%0.9%
Barren
0.4%0.6%
From 242 records placed within 100 m, beside all Ohio records placed the same way. People record where they go, so this shows where records come from, not where the species lives. Land cover: USGS Annual NLCD, 2025 (opens in a new tab)
Finer identifications
Some Ohio records of this species were identified to a subspecies:
Mergus merganser americanusCommon Merganser (North American)subspecies
Every one of these records counts toward the Common Merganser's season above.
Why some records go further than species
Many species vary from place to place. Groups of a species that look or sound a little different, and live in different areas, can be named as subspecies. Observers and experts only identify a record that far when it shows enough detail to tell them apart. Records without that detail count at the species level.
Names: Catalogue of Life.
Sources
Where these results come from
Records from iNaturalist research-grade observations and expert-identified GBIF datasets, CC0, CC BY and CC BY-NC. Sources
Seasons use the published method and its evidence thresholds. Methods
A spreadsheet (CSV) with a link to each record, on iNaturalist or GBIF. Records whose location was hidden by the observer or the source are counted but not linked.
