diff --git a/src/apps/advanced-search/AdvancedSearch.tsx b/src/apps/advanced-search/AdvancedSearch.tsx
index 072632736..16994c68a 100644
--- a/src/apps/advanced-search/AdvancedSearch.tsx
+++ b/src/apps/advanced-search/AdvancedSearch.tsx
@@ -2,7 +2,10 @@ import React, { useEffect, useState } from "react";
 import { useEffectOnce } from "react-use";
 import AdvancedSearchHeader from "./AdvancedSearchHeader";
 import AdvancedSearchResult from "./AdvancedSearchResults";
-import { translateSearchObjectToCql } from "./helpers";
+import {
+  commaSeparatedStringToArray,
+  translateSearchObjectToCql
+} from "./helpers";
 import { AdvancedSearchQuery } from "./types";
 import {
   getUrlQueryParam,
@@ -30,10 +33,11 @@ const AdvancedSearch: React.FC<AdvancedSearchProps> = ({ pageSize }) => {
   const [executedQuery, setExecutedQuery] = useState<string | null>(null);
 
   const [locationFilter, setLocationFilter] = useState<LocationFilter>({});
+
   const handleLocationChange = (location: string) => {
     setLocationFilter((prevFilter) => ({
       ...prevFilter,
-      location: [location]
+      location: commaSeparatedStringToArray(location)
     }));
     if (location) {
       setQueryParametersInUrl({ location });
@@ -41,10 +45,11 @@ const AdvancedSearch: React.FC<AdvancedSearchProps> = ({ pageSize }) => {
       removeQueryParametersFromUrl("location");
     }
   };
+
   const handleSublocationChange = (sublocation: string) => {
     setLocationFilter((prevFilter) => ({
       ...prevFilter,
-      sublocation: [sublocation]
+      sublocation: commaSeparatedStringToArray(sublocation)
     }));
     if (sublocation) {
       setQueryParametersInUrl({ sublocation });
@@ -98,7 +103,7 @@ const AdvancedSearch: React.FC<AdvancedSearchProps> = ({ pageSize }) => {
     if (locationParam) {
       setLocationFilter((prevFilter) => ({
         ...prevFilter,
-        location: [locationParam]
+        location: commaSeparatedStringToArray(locationParam)
       }));
     }
 
@@ -106,7 +111,7 @@ const AdvancedSearch: React.FC<AdvancedSearchProps> = ({ pageSize }) => {
     if (sublocationParam) {
       setLocationFilter((prevFilter) => ({
         ...prevFilter,
-        sublocation: [sublocationParam]
+        sublocation: commaSeparatedStringToArray(sublocationParam)
       }));
     }
   });
diff --git a/src/apps/advanced-search/AdvancedSearchResults.tsx b/src/apps/advanced-search/AdvancedSearchResults.tsx
index e44b23bb9..ed0ce6b8f 100644
--- a/src/apps/advanced-search/AdvancedSearchResults.tsx
+++ b/src/apps/advanced-search/AdvancedSearchResults.tsx
@@ -70,8 +70,10 @@ const AdvancedSearchResult: React.FC<AdvancedSearchResultProps> = ({
     filters: {
       branchId: cleanBranches,
       status: onShelf ? [HoldingsStatus.OnShelf] : [],
-      ...(locationFilter?.location && { location: locationFilter.location }),
-      ...(locationFilter?.sublocation && {
+      ...(locationFilter?.location?.length && {
+        location: locationFilter.location
+      }),
+      ...(locationFilter?.sublocation?.length && {
         sublocation: locationFilter.sublocation
       })
     }
diff --git a/src/apps/advanced-search/CqlSearchHeader.tsx b/src/apps/advanced-search/CqlSearchHeader.tsx
index 12e69bd9a..0ca9de982 100644
--- a/src/apps/advanced-search/CqlSearchHeader.tsx
+++ b/src/apps/advanced-search/CqlSearchHeader.tsx
@@ -1,4 +1,4 @@
-import React, { useEffect } from "react";
+import React, { useEffect, useState } from "react";
 import { useText } from "../../core/utils/text";
 import CheckBox from "../../components/checkbox/Checkbox";
 import TextInput from "../../components/atoms/input/TextInput";
@@ -33,6 +33,31 @@ const CqlSearchHeader: React.FC<CqlSearchHeaderProps> = ({
     }
   }, [initialCql, setCql]);
 
+  // Local state is needed to track input values as plain strings,
+  // since onLocationChange expects a comma-separated string,
+  // while locationFilter location and sublocation are provided as arrays.
+  const [inputValues, setInputValues] = useState({
+    location: locationFilter?.location?.join(", ") ?? "",
+    sublocation: locationFilter?.sublocation?.join(", ") ?? ""
+  });
+
+  const handleInputChange = (
+    name: "location" | "sublocation",
+    value: string
+  ) => {
+    setInputValues((prevValues) => ({
+      ...prevValues,
+      [name]: value
+    }));
+
+    if (name === "location") {
+      onLocationChange(value);
+    }
+    if (name === "sublocation") {
+      onSublocationChange(value);
+    }
+  };
+
   return (
     <>
       <h1
@@ -54,15 +79,17 @@ const CqlSearchHeader: React.FC<CqlSearchHeaderProps> = ({
         id="location"
         label="Location"
         type="text"
-        onChange={(location) => onLocationChange(location)}
-        value={locationFilter?.location?.[0] ?? ""}
+        onChange={(location) => handleInputChange("location", location)}
+        value={inputValues.location}
       />
       <TextInput
         id="Sublocation"
         label="Sublocation"
         type="text"
-        onChange={(sublocation) => onSublocationChange(sublocation)}
-        value={locationFilter?.sublocation?.[0] ?? ""}
+        onChange={(sublocation) =>
+          handleInputChange("sublocation", sublocation)
+        }
+        value={inputValues.sublocation}
       />
       <CheckBox
         id="on-shelf"
diff --git a/src/apps/advanced-search/LocationFilter.ts b/src/apps/advanced-search/LocationFilter.ts
index c5234a5d8..612701fa6 100644
--- a/src/apps/advanced-search/LocationFilter.ts
+++ b/src/apps/advanced-search/LocationFilter.ts
@@ -1,4 +1,4 @@
 export interface LocationFilter {
-  location?: [string];
-  sublocation?: [string];
+  location?: string[];
+  sublocation?: string[];
 }
diff --git a/src/apps/advanced-search/helpers.tsx b/src/apps/advanced-search/helpers.tsx
index c18ed8975..6f1cd5adc 100644
--- a/src/apps/advanced-search/helpers.tsx
+++ b/src/apps/advanced-search/helpers.tsx
@@ -130,4 +130,11 @@ export const shouldAdvancedSearchButtonBeDisabled = (
   }
 };
 
+export const commaSeparatedStringToArray = (input: string): string[] => {
+  return input
+    .split(",")
+    .map((s) => s.trim())
+    .filter((s) => s.length > 0);
+};
+
 export default {};