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 Valley Kansas
17. Oakdale Illinois
18. Oakhurst California
19. Oakland California
20. Oakland Cemetery Fort Madison Iowa
21. Oakland Iowa
22. Oakland Nebraska
23. Oakley Kansas
24. Oakwood Cemetery Parsons Kansas
25. Oakwood Oklahoma
26. Oberkassel Germany
27. Oberlin Kansas
28. Oberlin Ohio
29. Oblong Illinois
30. Oceanside California
31. Ochiltree County Texas
32. Odell Nebraska
33. Odessa Missouri
34. Odin Kansas
35. Oedheim Germany
36. Oelwein Iowa
37. Offerle Kansas
38. Ogle County Illinois
39. Oglesby Oklahoma
40. OH.
41. Ohiio
42. Ohio (154)
43. Ohio Co. IN.
44. Ohio County Indiana
45. Ohio Illinois
46. OIathe Kansas
47. Oiklahoma (2)
48. OK. (4)
49. Okalhoma
50. Okaloosa County Florida
51. Okawville Illinois
52. Okeene Oklahoma
53. Oketo Kansas
54. Okinawa
55. Okla. (1)
56. Oklahaoma (1)
57. Oklahoma (196)
58. Oklahoma City
59. Oklahoma City Oklahoma
60. Oklahoma Terr
61. Oklahoma Territory (2)
62. Oklahome City Oklahoma
63. Oklahomma (1)
64. Oklahona (1)
65. Okmulgee Oklahoma
66. Okolona Oklahoma
67. Olatha Kansas
68. Olathe Kansas
69. Old Grace Hill Mennonite Cemetery
70. Old Green Cemetery Tahlequah Oklahoma
71. Old Mexico
72. Oldsburg Kansas
73. Olean New York
74. Olin Iowa
75. Olin North Carolina
76. Olivet Kansas
77. Olivewood Cemetery Riverside California
78. Olmsted County Minnesota
79. Olongapo City Philippines
80. Olpe Kansas
81. Olsburg Kansas
82. Olustee Oklahoma
83. Olympia Washington
84. Omaha Arkansas
85. Omaha Nebraska
86. Omarga Illinois
87. Onancock Virginia
88. Ontario California
89. Ontario Canada
90. Oosterwolde Friesland Netherlands
91. Optima Oklahoma
92. Oquawka Illinois
93. Oraibi Arizona
94. Orange California
95. Orange co. CA.
96. Orange County California
97. Orange County Indiana
98. Orange Park Florida
99. Orange Texas
100. Orangeburg South Carolina
101. Ord Nebraska
102. Ordway Colorado
103. Oregon (14)
104. Oregon City Oregon
105. Oregon Wisconsin
106. Orem Utah
107. Orient Pennsylvania
108. Orienta Oklahoma
109. Orlando Florida
110. Orlando Oklahoma
111. Oro Valley Arizona
112. Oronogo Missouri
113. Orrville Ohio
114. Orville Ohio
115. Osage City Kansas
116. Osage County Kansas
117. Osage County Missouri
118. Osage County Oklahoma
119. Osage Iowa
120. Osage Oklahoma
121. Osage Township Newton County Arkansas
122. Osawatomie Kansas
123. Osborn Missouri
124. Osborne County Kansas
125. Osborne Kansas
126. Osceaola Indiana
127. Osceola Nebraska
128. Osco Illinois
129. Osco Township Henry County Illinois
130. Oshkosh Nebraska
131. Oskaloosa Iowa
132. Oskaloosa Kansas
133. Oslo Norway
134. Osnaborok North Dakota
135. Osnabruck Hanover Germany
136. Osterberg Germany
137. Ostroga Polish Russia
138. Oswego Cemetery Oswego Kansas
139. Oswego Kansas
140. Otho Iowa
141. Otis Kansas
142. Otoe Nebraska
143. Otsego New York
144. Ottawa County Kansas
145. Ottawa Kansas
146. Otter Creek Kansas
147. Otto Indiana
148. Ottumwa Iowa
149. Our Lady of Guadalupe Catholic Church Cemetery
150. Oustroge Poland Russia
151. Overbrook Kansas
152. Overland Park Kansas
153. Owasso Oklahoma
154. Owen County Indiana
155. Owens Cross Roads Alabama
156. Oxford Kansas
157. Oxford Mississippi
158. Oxford Ohio
159. Oxford Pennsylvania
160. Oxnard California
161. Ozark Arkansas
162. Ozark County Missouri
163. Ozark Missouri
164. Ozaukee Wisconsin
165. Ozawkie (2)
166. Ozawkie Kansas