Updated list of which states and counties I have:
States I have at least one plate from:
Alabama
Arizona
Arkansas
California
Colorado
Florida
Georgia
Hawaii
Illinois
Iowa
Kansas
Kentucky
Maine
Maryland
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
New Hampshire
New Jersey
New York
North Carolina
North Dakota
Ohio
Oregon
Pennsylvania
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
States I still need:
Alaska
Connecticut
Delaware
Idaho
Indiana
Louisiana
Massachusetts
Nevada
New Mexico
Oklahoma
Rhode Island
West Virginia
Wisconsin
Wyoming
Nebraska Counties I have at least one plate from:
1 Douglas - 1972 passenger plate - ok
2 Lancaster - 1990-1992 passenger plate - ok
3 Gage - 1999-2001 red FARM TRUCK plate - rough
4 Custer - 1976-1983 passenger - rough shape
5 Dodge - 1996-1998 passenger plate - ok
6 Saunders - 1993-1995 passenger plate - ok
7 Madison - 1941 plate - light rust
8 Hall - 1984-1986 plate passenger - ok
10 Platte - 1956 plate - light rust
11 Otoe - 1957 plate - light rust
12 Knox - 2002-2004 passenger plate - rough
13 Cedar - 2002-2004 passenger plate - ok
14 Adams - 1969 passenger plate - ok
15 Lincoln - 1976-1983 passenger plate - good
16 Seward - 1987-1989 passenger plate - good
17 York - 1984-1986 passenger plate - pristine
20 Cass - 1935 plate - ok
21 Scottsbluff - 1987-1989 passenger plate - good
22 Saline - flat plate - 2005-2010 passenger flat plate - ok
23 Boone - 1965 plate - light rust
24 Cumming - 1938 plate - light rust
25 Butler - 1949 plate - ok
26 Antelope - 1985-1987 passenger plate
27 Wayne - 1972 FARM TRUCK plate - good
28 Hamilton - 1972 passenger plate - rough
29 Washington - 2005-2010 flat passenger plate - rough
30 Clay - 2005-2010 flat passenger plate - good
31 Burt - 1969 passenger plate - ok
32 Thayer - 1949 plate - ok
33 Jefferson - 1996-1998 passenger plate - good
34 Fillmore - 1948 plate - ok
35 Dixon - 1972 passenger plate - pristine
36 Holt - 1976-1983 passenger plate - ok
37 Phelps - 1993-1995 blue FARM TRUCK plate
40 Pierce - 1958 plate (with metal 59 tag) - good
41 Polk - 1948 plate - good
42 Nuckolls - 1972 passenger plate - good
43 Colfax - 1976-1983 passenger plate -rough
47 Valley - 2005-2010 flat FARM TRUCK plate - good
48 Red Willow - 1996-1998 passenger plate - good
51 Harlan - 1960 LOCL plate - good
55 Thurston - 1996-1998 passenger plate - good
57 Johnson - 1957 plate - light rust
58 Nance - 1987-1989 passenger plate - good
59 Sarpy - 1999-2001 passenger plate - good
60 Frontier - 1965 BUS plate - good
61 Sheridan - 1965 passenger plate - good
62 Greeley - 1974 6 MON TRUCK plate - good
64 Morril - 1958 plate (with metal 59 tag) - ok
65 Box Butte - 1972 passenger plate - rough, no paint
66 Cherry - 2002-2004 passenger plate - ok
72 Chase - 1963-1964 plate - ok
73 Gosper - 1969 FARM TRUCK plate - rough shape
74 Perkins - 1976 FARM TRUCK plate - good
77 Garden - not sure - rough, no paint
78 Deuel - 1965 plate - good
82 Keya Paha - 1996-1998 black FARM TRUCK plate
85 Banner - 1938 plate -rough, no paint
93 Hooker - 1993-1995 passenger plate - good
94 DMV sample plate - 1965 - pristine
Nebraska Counties I still need a plate from:
9 Buffalo
18 Dawson
19 Richardson
38 Furnas
39 Cheyenne
44 Nemaha
45 Webster
46 Merrick
49 Howard
50 Franklin
52 Kearney
53 Stanton
54 Pawnee
56 Sherman
63 Boyd
67 Hitchcock
68 Keith
69 Dawes
70 Dakota
71 Kimball
75 Brown
76 Dundy
79 Hayes
80 Sioux
81 Rock
83 Garfield
84 Wheeler
86 Blaine
87 Logan
88 Loup
89 Thomas
90 McPherson
91 Arthur
92 Grant
Martin