diff --git a/packages/arcgis-rest-portal/src/util/generic-search.ts b/packages/arcgis-rest-portal/src/util/generic-search.ts
index 183a8e10d8..7a13c365d8 100644
--- a/packages/arcgis-rest-portal/src/util/generic-search.ts
+++ b/packages/arcgis-rest-portal/src/util/generic-search.ts
@@ -35,7 +35,7 @@ export function genericSearch<T extends IItem | IGroup | IUser>(
       }
     };
   } else {
-    // searchUserAccess has one (knonw) valid value: "groupMember"
+    // searchUserAccess has one (known) valid value: "groupMember"
     options = appendCustomParams<ISearchOptions>(
       search,
       [
@@ -45,7 +45,12 @@ export function genericSearch<T extends IItem | IGroup | IUser>(
         "sortField",
         "sortOrder",
         "searchUserAccess",
-        "searchUserName"
+        "searchUserName",
+        "filter",
+        "countFields",
+        "countSize",
+        "categories",
+        "categoryFilters"
       ],
       {
         httpMethod: "GET"
diff --git a/packages/arcgis-rest-portal/src/util/search.ts b/packages/arcgis-rest-portal/src/util/search.ts
index ed18e0a527..2494fbec5e 100644
--- a/packages/arcgis-rest-portal/src/util/search.ts
+++ b/packages/arcgis-rest-portal/src/util/search.ts
@@ -14,6 +14,22 @@ export interface ISearchOptions extends IRequestOptions, IPagingParams {
 
   /** Describes whether order returns in ascending or descending order. The default is ascending. */
   sortOrder?: "asc" | "desc";
+
+  /** A comma-separated list of fields to count. The maximum count fields allowed per request is three. Supported count fields are tags, type, access, contentstatus, and categories. */
+  countFields?: string;
+
+  /** The maximum number of field values to count for each `countFields`. The default value is 10, and the maximum number allowed is 200. */
+  countSize?: number;
+
+  /** Structured filtering is accomplished by specifying a field name followed by a colon and the term you are searching for with double quotation marks. It allows the passing in of application-level filters based on the context. Use an exact keyword match of the expected value for the specified field. Partially matching the filter keyword will not return meaningful results. */
+  filter?: string;
+
+  /** A JSON array or comma-separated list of up to eight org content categories to search items. */
+  categories?: string | Array<string>;
+
+  /** A comma-separated list of up to three category terms to search for items that have matching categories. */
+  categoryFilters?: string;
+
   [key: string]: any;
 }
 
diff --git a/packages/arcgis-rest-portal/test/items/search.test.ts b/packages/arcgis-rest-portal/test/items/search.test.ts
index a66dab15ea..7021222b54 100644
--- a/packages/arcgis-rest-portal/test/items/search.test.ts
+++ b/packages/arcgis-rest-portal/test/items/search.test.ts
@@ -82,6 +82,75 @@ describe("search", () => {
       });
   });
 
+  it("should take filter, countFields, countSize and construct the request", (done) => {
+    fetchMock.once("*", SearchResponse);
+
+    searchItems({
+      q: "DC",
+      countFields: "tags, type",
+      countSize: 15,
+      filter: `title:"Some Exact Title"`,
+      sortOrder: "desc",
+      foo: "bar" // this one should not end up on the url
+    })
+      .then(() => {
+        expect(fetchMock.called()).toEqual(true);
+        const [url, options]: [string, RequestInit] = fetchMock.lastCall("*");
+        expect(url).toEqual(
+          "https://www.arcgis.com/sharing/rest/search?f=json&q=DC&sortOrder=desc&filter=title%3A%22Some%20Exact%20Title%22&countFields=tags%2C%20type&countSize=15"
+        );
+        expect(options.method).toBe("GET");
+        done();
+      })
+      .catch((e) => {
+        fail(e);
+      });
+  });
+
+  it("should take categories, categoryFilters and construct the request", (done) => {
+    fetchMock.once("*", SearchResponse);
+
+    searchItems({
+      q: "DC",
+      categories: "/Region/US,/Forest",
+      categoryFilters: "ocean",
+      foo: "bar" // this one should not end up on the url
+    })
+      .then(() => {
+        expect(fetchMock.called()).toEqual(true);
+        const [url, options]: [string, RequestInit] = fetchMock.lastCall("*");
+        expect(url).toEqual(
+          "https://www.arcgis.com/sharing/rest/search?f=json&q=DC&categories=%2FRegion%2FUS%2C%2FForest&categoryFilters=ocean"
+        );
+        expect(options.method).toBe("GET");
+        done();
+      })
+      .catch((e) => {
+        fail(e);
+      });
+  });
+
+  it("should accept categories as an array", (done) => {
+    fetchMock.once("*", SearchResponse);
+
+    searchItems({
+      q: "Washington",
+      categories: ["/Categories/Water", "/Categories/Forest"]
+    })
+      .then(() => {
+        expect(fetchMock.called()).toEqual(true);
+        const [url, options]: [string, RequestInit] = fetchMock.lastCall("*");
+        expect(url).toEqual(
+          "https://www.arcgis.com/sharing/rest/search?f=json&q=Washington&categories=%2FCategories%2FWater%2C%2FCategories%2FForest"
+        );
+        expect(options.method).toBe("GET");
+        done();
+      })
+      .catch((e) => {
+        fail(e);
+      });
+  });
+
   it("should properly handle options for which 0 is a valid value", (done) => {
     fetchMock.once("*", SearchResponse);