diff --git a/src/gazetteers.h b/src/gazetteers.h
new file mode 100644
index 00000000..d923d1f3
--- /dev/null
+++ b/src/gazetteers.h
@@ -0,0 +1,108 @@
+#ifndef GAZETTEERS_H
+#define GAZETTEERS_H
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#define ADDRESS_ANY UINT64_C(1) << 0
+#define ADDRESS_NAME UINT64_C(1) << 1
+#define ADDRESS_HOUSE_NUMBER UINT64_C(1) << 2
+#define ADDRESS_STREET UINT64_C(1) << 3
+#define ADDRESS_UNIT UINT64_C(1) << 4
+
+#define ADDRESS_LOCALITY UINT64_C(1) << 32
+#define ADDRESS_ADMIN1 UINT64_C(1) << 33
+#define ADDRESS_ADMIN2 UINT64_C(1) << 34
+#define ADDRESS_ADMIN3 UINT64_C(1) << 35
+#define ADDRESS_ADMIN4 UINT64_C(1) << 36
+#define ADDRESS_ADMIN_OTHER UINT64_C(1) << 37
+#define ADDRESS_COUNTRY UINT64_C(1) << 38
+#define ADDRESS_POSTAL_CODE UINT64_C(1) << 39
+#define ADDRESS_NEIGHBORHOOD UINT64_C(1) << 40
+
+typedef enum dictionary_type {
+    DICTIONARY_ANY = 1,
+    DICTIONARY_SYNONYM = 2,
+    DICTIONARY_STOPWORD = 3,
+    DICTIONARY_ELISION = 4,
+
+    DICTIONARY_STREET_NAME = 10,
+    DICTIONARY_STREET_TYPE = 11,
+    DICTIONARY_CONCATENATED_SEPARABLE = 12,
+    DICTIONARY_CONCATENATED_INSEPARABLE = 13,
+    DICTIONARY_DIRECTIONAL = 14,
+    DICTIONARY_QUALIFIER = 15,
+    DICTIONARY_BUILDING_TYPE = 16,
+    DICTIONARY_LEVEL = 17,
+    DICTIONARY_UNIT = 18,
+    DICTIONARY_POST_OFFICE = 19,
+    DICTIONARY_NO_ADDRESS = 20,
+    DICTIONARY_NULL = 21,
+    
+    DICTIONARY_PLACE_NAME = 50,
+    DICTIONARY_COMPANY_TYPE = 51,
+    DICTIONARY_GIVEN_NAME = 52,
+    DICTIONARY_SURNAME = 53,
+    DICTIONARY_PERSONAL_TITLE = 54,
+    DICTIONARY_PERSONAL_SUFFIX = 55,
+    DICTIONARY_ACADEMIC_DEGREE = 56,
+
+    DICTIONARY_LOCALITY = 100,
+    DICTIONARY_ADMIN1 = 101,
+    DICTIONARY_ADMIN2 = 102,
+    DICTIONARY_ADMIN3 = 103,
+    DICTIONARY_ADMIN4 = 104,
+    DICTIONARY_ADMIN_OTHER = 105,
+    DICTIONARY_NEIGHBORHOOD = 106,
+    DICTIONARY_POSTAL_CODE = 107,
+    DICTIONARY_COUNTRY = 108,
+    DICTIONARY_TOPONYM = 109
+
+} dictionary_type_t;
+
+typedef struct gazetteer {
+    char name[64];
+    dictionary_type_t type;
+    uint64_t address_components;
+} gazetteer_t;
+
+// Only need these for the in-memory dictionaries
+gazetteer_t gazetteers[] = {
+    {"academic_degrees", DICTIONARY_ACADEMIC_DEGREE, ADDRESS_NAME},
+    {"building_types", DICTIONARY_BUILDING_TYPE, ADDRESS_NAME | ADDRESS_HOUSE_NUMBER | ADDRESS_STREET | ADDRESS_UNIT},
+    {"company_types", DICTIONARY_COMPANY_TYPE, ADDRESS_NAME},
+    {"concatenated_suffixes_inseparable", DICTIONARY_CONCATENATED_INSEPARABLE, ADDRESS_STREET},
+    {"concatenated_suffixes_separable", DICTIONARY_CONCATENATED_SEPARABLE, ADDRESS_STREET},
+    {"directionals", DICTIONARY_DIRECTIONAL, ADDRESS_ANY},
+    {"elisions", DICTIONARY_ELISION, ADDRESS_ANY},
+    {"given_names", DICTIONARY_GIVEN_NAME, ADDRESS_STREET | ADDRESS_NAME},
+    {"level_types", DICTIONARY_LEVEL, ADDRESS_HOUSE_NUMBER | ADDRESS_STREET | ADDRESS_UNIT},
+    {"no_number", DICTIONARY_NO_ADDRESS, ADDRESS_HOUSE_NUMBER | ADDRESS_STREET},
+    {"nulls", DICTIONARY_NULL, ADDRESS_ANY},
+    {"personal_suffixes", DICTIONARY_PERSONAL_SUFFIX, ADDRESS_NAME | ADDRESS_STREET},
+    {"personal_titles", DICTIONARY_PERSONAL_TITLE, ADDRESS_NAME | ADDRESS_STREET},
+    {"place_names", DICTIONARY_PLACE_NAME, ADDRESS_NAME | ADDRESS_STREET},
+    {"post_office", DICTIONARY_POST_OFFICE, ADDRESS_HOUSE_NUMBER | ADDRESS_STREET},
+    {"qualifiers", DICTIONARY_QUALIFIER, ADDRESS_STREET},
+    {"stopwords", DICTIONARY_STOPWORD, ADDRESS_ANY},
+    {"street_types", DICTIONARY_STREET_TYPE, ADDRESS_STREET},
+    {"surnames", DICTIONARY_SURNAME, ADDRESS_STREET | ADDRESS_NAME},
+    {"synonyms", DICTIONARY_SYNONYM, ADDRESS_ANY},
+    {"toponyms", DICTIONARY_TOPONYM, ADDRESS_LOCALITY | ADDRESS_ADMIN1 | ADDRESS_ADMIN2 | ADDRESS_ADMIN3 | ADDRESS_ADMIN4 | ADDRESS_ADMIN_OTHER | ADDRESS_NEIGHBORHOOD},
+    {"unit_types", DICTIONARY_UNIT, ADDRESS_NAME | ADDRESS_HOUSE_NUMBER | ADDRESS_STREET}
+};
+
+#define NUM_DICTIONARY_TYPES sizeof(gazetteers) / sizeof(gazetteer_t)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+