diff --git a/src/main/java/uk/gov/pay/connector/northamericaregion/CanadaPostalcodeToProvinceOrTerritoryMapper.java b/src/main/java/uk/gov/pay/connector/northamericaregion/CanadaPostalcodeToProvinceOrTerritoryMapper.java
index 390320a538..cddac68055 100644
--- a/src/main/java/uk/gov/pay/connector/northamericaregion/CanadaPostalcodeToProvinceOrTerritoryMapper.java
+++ b/src/main/java/uk/gov/pay/connector/northamericaregion/CanadaPostalcodeToProvinceOrTerritoryMapper.java
@@ -5,27 +5,27 @@
 import java.util.regex.Pattern;
 
 import static java.util.Map.entry;
+import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.ALBERTA;
+import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.BRITISH_COLUMBIA;
+import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.MANITOBA;
 import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NEWFOUNDLAND_AND_LABRADOR;
+import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NEW_BRUNSWICK;
+import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NORTHWEST_TERRITORIES;
 import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NOVA_SCOTIA;
+import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NUNAVUT;
+import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.ONTARIO;
 import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.PRINCE_EDWARD_ISLAND;
-import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NEW_BRUNSWICK;
 import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.QUEBEC;
-import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.ONTARIO;
 import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.SASKATCHEWAN;
-import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.MANITOBA;
-import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.ALBERTA;
-import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.BRITISH_COLUMBIA;
 import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.YUKON;
-import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NUNAVUT;
-import static uk.gov.pay.connector.northamericaregion.CanadaProvinceOrTerritory.NORTHWEST_TERRITORIES;
 
 public class CanadaPostalcodeToProvinceOrTerritoryMapper {
 
-    private final Pattern WELL_FORMED_POSTAL_CODE = Pattern.compile("([A-Z])[0-9][A-Z][0-9][A-Z][0-9]");
-    private final Pattern WELL_FORMED_X_POSTAL_CODE = Pattern.compile("(X[0-9][A-Z])[0-9][A-Z][0-9]");
-    private final String SANTA_CLAUS_POSTAL_CODE = "H0H0H0";
+    private static final Pattern WELL_FORMED_POSTAL_CODE = Pattern.compile("([A-Z])[0-9][A-Z][0-9][A-Z][0-9]");
+    private static final Pattern WELL_FORMED_X_POSTAL_CODE = Pattern.compile("(X[0-9][A-Z])[0-9][A-Z][0-9]");
+    private static final String SANTA_CLAUS_POSTAL_CODE = "H0H0H0";
 
-    public final Map<String, CanadaProvinceOrTerritory> NON_X_POSTAL_CODE_TERRITORY_PROVINCE_MAP = Map.ofEntries(
+    private static final Map<String, CanadaProvinceOrTerritory> NON_X_POSTAL_CODE_TERRITORY_PROVINCE_MAP = Map.ofEntries(
             entry("A", NEWFOUNDLAND_AND_LABRADOR),
             entry("B", NOVA_SCOTIA),
             entry("C", PRINCE_EDWARD_ISLAND),
@@ -45,7 +45,7 @@ public class CanadaPostalcodeToProvinceOrTerritoryMapper {
             entry("Y", YUKON)
     );
 
-    public final Map<String, CanadaProvinceOrTerritory> X_POSTAL_CODE_TERRITORY_MAP = Map.ofEntries(
+    private static final Map<String, CanadaProvinceOrTerritory> X_POSTAL_CODE_TERRITORY_MAP = Map.ofEntries(
             entry("X0A", NUNAVUT),
             entry("X0B", NUNAVUT),
             entry("X0C", NUNAVUT),
diff --git a/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMap.java b/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMap.java
index 5693651f82..04051bb560 100644
--- a/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMap.java
+++ b/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMap.java
@@ -5,11 +5,11 @@
 
 import static uk.gov.pay.connector.northamericaregion.UsState.ALABAMA;
 import static uk.gov.pay.connector.northamericaregion.UsState.ALASKA;
-import static uk.gov.pay.connector.northamericaregion.UsState.ARMED_FORCES_AMERICAS;
 import static uk.gov.pay.connector.northamericaregion.UsState.ARIZONA;
 import static uk.gov.pay.connector.northamericaregion.UsState.ARKANSAS;
-import static uk.gov.pay.connector.northamericaregion.UsState.ARMED_FORCES_PACIFIC;
+import static uk.gov.pay.connector.northamericaregion.UsState.ARMED_FORCES_AMERICAS;
 import static uk.gov.pay.connector.northamericaregion.UsState.ARMED_FORCES_EUROPE;
+import static uk.gov.pay.connector.northamericaregion.UsState.ARMED_FORCES_PACIFIC;
 import static uk.gov.pay.connector.northamericaregion.UsState.CALIFORNIA;
 import static uk.gov.pay.connector.northamericaregion.UsState.COLORADO;
 import static uk.gov.pay.connector.northamericaregion.UsState.CONNECTICUT;
@@ -64,10 +64,10 @@
 public class UsZipCodeToStateMap {
     
     /**
-    We have to use this initializiation method because using 'Map.ofEntries(...)' with hundreds of arguments is excessively slow to compile. See https://youtrack.jetbrains.com/issue/IDEA-245963
-     */
-
-    public final static Map<String, UsState> ZIP_CODE_TO_US_STATE_ABBREVIATIONS = Map.copyOf(new HashMap<>() {{
+     * We have to use this initializiation method because using 'Map.ofEntries(...)' with hundreds of arguments is excessively slow to compile.
+     * See https://youtrack.jetbrains.com/issue/IDEA-245963
+    **/
+    public static final Map<String, UsState> ZIP_CODE_TO_US_STATE_ABBREVIATIONS = Map.copyOf(new HashMap<>() {{
         put("005", NEW_YORK);
         put("006", PUERTO_RICO);
         put("007", PUERTO_RICO);
diff --git a/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMapper.java b/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMapper.java
index e67b987efc..981d8b4e07 100644
--- a/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMapper.java
+++ b/src/main/java/uk/gov/pay/connector/northamericaregion/UsZipCodeToStateMapper.java
@@ -10,9 +10,10 @@
 
 public class UsZipCodeToStateMapper {
 
-    private final Pattern WELL_FORMED_ZIP_CODE_AND_OPTIONAL_PLUS_FOUR = Pattern.compile("([0-9]{3})[0-9]{2}(?:-[0-9]{4})?");
-    private final Pattern WELL_FORMED_STATE_WITH_ZIP_CODE_AND_OPTIONAL_PLUS_FOUR = Pattern.compile("([A-Z]{2})[0-9]{5}(?:-[0-9]{4})?");
-    private final Map<String, UsState> US_STATE_ABBREVIATIONS_MAPPING = Arrays.stream(UsState.values()).collect(
+    private static final Pattern WELL_FORMED_ZIP_CODE_AND_OPTIONAL_PLUS_FOUR = Pattern.compile("([0-9]{3})[0-9]{2}(?:-[0-9]{4})?");
+    private static final Pattern WELL_FORMED_STATE_WITH_ZIP_CODE_AND_OPTIONAL_PLUS_FOUR = Pattern.compile("([A-Z]{2})[0-9]{5}(?:-[0-9]{4})?");
+
+    private static final Map<String, UsState> US_STATE_ABBREVIATIONS_MAPPING = Arrays.stream(UsState.values()).collect(
             toUnmodifiableMap(NorthAmericaRegion::getAbbreviation, identity())); 
 
     public Optional<UsState> getState(String normalisedZipCode) {