Place List: O, sorted alphabetically (number of total localities in parentheses):
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1. O klahoma (3)
2. O'
3. O'Dell Family Farm Cemetery
4. O'Fallon Illinois
5. O'Fallon Missouri
6. O'Neill Nebraska
7. O. (1)
8. Oak Creek Colorado
9. Oak Hill Cemetery Butler Missouri
10. Oak Hill Cemetery Lawrence Kansas
11. Oak Hill Crawford county Missouri
12. Oak Hill Kansas
13. Oak Hill Memorial Park Escondido California
14. Oak Hill Missouri
15. Oak Park Chicago Illinois
16. Oak Park Illinois
17. Oak Valley Kansas
18. Oakdale Illinois
19. Oakhurst California
20. Oakland California
21. Oakland Cemetery Fort Madison Iowa
22. Oakland Iowa
23. Oakland Nebraska
24. Oakley Kansas
25. Oakwood Cemetery Parsons Kansas
26. Oakwood Oklahoma
27. Oberkassel Germany
28. Oberlin Kansas
29. Oberlin Ohio
30. Oblong Illinois
31. Oceanside California
32. Ochiltree County Texas
33. Odell Nebraska
34. Odessa Missouri
35. Odin Kansas
36. Oedheim Germany
37. Oelwein Iowa
38. Offerle Kansas
39. Ogle County Illinois
40. Oglesby Oklahoma
41. OH.
42. Ohiio
43. Ohio (156)
44. Ohio Co. IN.
45. Ohio County Indiana
46. Ohio Illinois
47. OIathe Kansas
48. Oiklahoma (2)
49. Oilton Oklahoma
50. OK. (4)
51. Okalhoma
52. Okaloosa County Florida
53. Okawville Illinois
54. Okeene Oklahoma
55. Oketo Kansas
56. Okinawa
57. Okla. (1)
58. Oklahaoma (1)
59. Oklahoma (198)
60. Oklahoma City
61. Oklahoma City Oklahoma
62. Oklahoma Terr
63. Oklahoma Territory (2)
64. Oklahome City Oklahoma
65. Oklahomma (1)
66. Oklahona (1)
67. Okmulgee Oklahoma
68. Okolona Oklahoma
69. Olatha Kansas
70. Olathe Kansas
71. Old Grace Hill Mennonite Cemetery
72. Old Green Cemetery Tahlequah Oklahoma
73. Old Mexico
74. Oldsburg Kansas
75. Olean New York
76. Olin Iowa
77. Olin North Carolina
78. Olivet Kansas
79. Olivewood Cemetery Riverside California
80. Olmsted County Minnesota
81. Olmsted Minnesota
82. Olongapo City Philippines
83. Olpe Kansas
84. Olsburg Kansas
85. Olustee Oklahoma
86. Olympia Washington
87. Omaha Arkansas
88. Omaha Nebraska
89. Omarga Illinois
90. Onaga Kansas
91. Onancock Virginia
92. Ontario California
93. Ontario Canada
94. Oosterwolde Friesland Netherlands
95. Optima Oklahoma
96. Oquawka Illinois
97. Oraibi Arizona
98. Orange California
99. Orange co. CA.
100. Orange County California
101. Orange County Indiana
102. Orange Park Florida
103. Orange Texas
104. Orangeburg South Carolina
105. Ord Nebraska
106. Ordway Colorado
107. Oregon (14)
108. Oregon City Oregon
109. Oregon Wisconsin
110. Orem Utah
111. Orient Pennsylvania
112. Orienta Oklahoma
113. Orlando Florida
114. Orlando Oklahoma
115. Oro Valley Arizona
116. Orofino Idaho
117. Oronogo Missouri
118. Oroville California
119. Orrville Ohio
120. Orville Ohio
121. Osage City Kansas
122. Osage County Kansas
123. Osage County Missouri
124. Osage County Oklahoma
125. Osage Iowa
126. Osage Oklahoma
127. Osage Township Newton County Arkansas
128. Osawatomie Kansas
129. Osborn Missouri
130. Osborne County Kansas
131. Osborne Kansas
132. Osbourne Kansas
133. Osceaola Indiana
134. Osceola Nebraska
135. Osco Illinois
136. Osco Township Henry County Illinois
137. Oshkosh Nebraska
138. Oskaloosa Iowa
139. Oskaloosa Kansas
140. Oslo Norway
141. Osnaborok North Dakota
142. Osnabruck Hanover Germany
143. Ost Kansas
144. Osterberg Germany
145. Ostroga Polish Russia
146. Oswego Cemetery Oswego Kansas
147. Oswego Kansas
148. Otero County Colorado
149. Otho Iowa
150. Otis Kansas
151. Otoe Nebraska
152. Otsego New York
153. Ottawa County Kansas
154. Ottawa Kansas
155. Otter Creek Kansas
156. Otto Indiana
157. Ottumwa Iowa
158. Our Lady of Guadalupe Catholic Church Cemetery
159. Oustroge Poland Russia
160. Overbrook Kansas
161. Overland Park Kansas
162. Owasso Oklahoma
163. Owen County Indiana
164. Owens Cross Roads Alabama
165. Oxford Kansas
166. Oxford Mississippi
167. Oxford Ohio
168. Oxford Pennsylvania
169. Oxnard California
170. Ozark Arkansas
171. Ozark County Missouri
172. Ozark Missouri
173. Ozaukee Wisconsin
174. Ozawkie (2)
175. Ozawkie Kansas