diff --git a/docs/02_concepts/04_proxy_management.mdx b/docs/02_concepts/04_proxy_management.mdx
index 8f35ccf692..8a666cbadd 100644
--- a/docs/02_concepts/04_proxy_management.mdx
+++ b/docs/02_concepts/04_proxy_management.mdx
@@ -142,20 +142,18 @@ The difference is easy to remember. <ApiLink to="apify/interface/ProxyConfigurat
 
 ## Apify Proxy Configuration
 
-With Apify Proxy, you can select specific proxy groups to use, or countries to connect from.
-This allows you to get better proxy performance after some initial research.
+With Apify Proxy, you can select specific proxy groups to use, or countries to connect from. For even finer control, you can also target a specific subdivision (e.g. a US state) using the `subdivisionCode` option alongside `countryCode`. This allows you to get better proxy performance after some initial research.
 
 ```javascript
 const proxyConfiguration = await Actor.createProxyConfiguration({
     groups: ['RESIDENTIAL'],
     countryCode: 'US',
+    subdivisionCode: 'CA',
 });
 const proxyUrl = proxyConfiguration.newUrl();
 ```
 
-Now your crawlers will use only Residential proxies from the US. Note that you must first get access
-to a proxy group before you are able to use it. You can find your available proxy groups
-in the [proxy dashboard](https://console.apify.com/proxy).
+Now your crawlers will use only Residential proxies from California, US. The `subdivisionCode` accepts a 1–3 character [ISO 3166-2](https://en.wikipedia.org/wiki/ISO_3166-2) code (e.g. `CA` for California) and currently only works for the United States (`countryCode: 'US'`). Note that you must first get access to a proxy group before you are able to use it. You can find your available proxy groups in the [proxy dashboard](https://console.apify.com/proxy).
 
 ## Inspecting current proxy in Crawlers
 
diff --git a/src/proxy_configuration.ts b/src/proxy_configuration.ts
index 68a8360f32..5cf455b79b 100644
--- a/src/proxy_configuration.ts
+++ b/src/proxy_configuration.ts
@@ -17,6 +17,8 @@ const MAX_SESSION_ID_LENGTH = 50;
 const CHECK_ACCESS_REQUEST_TIMEOUT_MILLIS = 4_000;
 const CHECK_ACCESS_MAX_ATTEMPTS = 2;
 const COUNTRY_CODE_REGEX = /^[A-Z]{2}$/;
+// ISO 3166-2 subdivision codes are 1–3 uppercase alphanumeric characters, e.g. 'CA' (California), 'NSW' (New South Wales), '9' (Wien, AT-9)
+const SUBDIVISION_CODE_REGEX = /^[A-Z0-9]{1,3}$/;
 
 export interface ProxyConfigurationOptions extends CoreProxyConfigurationOptions {
     /**
@@ -46,16 +48,29 @@ export interface ProxyConfigurationOptions extends CoreProxyConfigurationOptions
 
     /**
      * Same option as `groups` which can be used to
-     * configurate the proxy by UI input schema. You should use the `groups` option in your crawler code.
+     * configure the proxy by UI input schema. You should use the `groups` option in your crawler code.
      */
     apifyProxyGroups?: string[];
 
     /**
      * Same option as `countryCode` which can be used to
-     * configurate the proxy by UI input schema. You should use the `countryCode` option in your crawler code.
+     * configure the proxy by UI input schema. You should use the `countryCode` option in your crawler code.
      */
     apifyProxyCountry?: string;
 
+    /**
+     * If set, all proxied requests will use IP addresses geolocated to the specified subdivision (e.g. US state).
+     * Requires `countryCode` to be set. The value must follow the ISO 3166-2 subdivision code format,
+     * e.g. `'CA'` for California when `countryCode` is `'US'`.
+     */
+    subdivisionCode?: string;
+
+    /**
+     * Same option as `subdivisionCode` which can be used to
+     * configure the proxy by UI input schema. You should use the `subdivisionCode` option in your crawler code.
+     */
+    apifyProxySubdivision?: string;
+
     /**
      * Multiple different ProxyConfigurationOptions stratified into tiers. Crawlee crawlers will switch between those tiers
      * based on the blocked request statistics.
@@ -123,6 +138,12 @@ export interface ProxyInfo extends CoreProxyInfo {
      */
     countryCode?: string;
 
+    /**
+     * If set, all proxied requests use IP addresses geolocated to the specified subdivision (e.g. US state).
+     * ISO 3166-2 subdivision code, e.g. `'CA'` when `countryCode` is `'US'`.
+     */
+    subdivisionCode?: string;
+
     /**
      * User's password for the proxy. By default, it is taken from the `APIFY_PROXY_PASSWORD`
      * environment variable, which is automatically set by the system when running the Actors
@@ -167,6 +188,7 @@ export interface ProxyInfo extends CoreProxyInfo {
 export class ProxyConfiguration extends CoreProxyConfiguration {
     private groups: string[];
     private countryCode?: string;
+    private subdivisionCode?: string;
     private password?: string;
     private hostname: string;
     private port?: number;
@@ -187,7 +209,7 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
         });
         ow(
             rest,
-            ow.object.exactShape({
+            ow.object.partialShape({
                 groups: ow.optional.array.ofType(
                     ow.string.matches(APIFY_PROXY_VALUE_REGEX),
                 ),
@@ -197,6 +219,12 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
                 countryCode: ow.optional.string.matches(COUNTRY_CODE_REGEX),
                 apifyProxyCountry:
                     ow.optional.string.matches(COUNTRY_CODE_REGEX),
+                subdivisionCode: ow.optional.string.matches(
+                    SUBDIVISION_CODE_REGEX,
+                ),
+                apifyProxySubdivision: ow.optional.string.matches(
+                    SUBDIVISION_CODE_REGEX,
+                ),
                 password: ow.optional.string,
                 tieredProxyUrls: ow.optional.array.ofType(
                     ow.array.ofType(ow.string),
@@ -210,6 +238,8 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
             apifyProxyGroups = [],
             countryCode,
             apifyProxyCountry,
+            subdivisionCode,
+            apifyProxySubdivision,
             password = config.get('proxyPassword'),
             tieredProxyConfig,
             tieredProxyUrls,
@@ -226,13 +256,20 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
 
         const groupsToUse = groups.length ? groups : apifyProxyGroups;
         const countryCodeToUse = countryCode || apifyProxyCountry;
+        const subdivisionCodeToUse = subdivisionCode || apifyProxySubdivision;
         const hostname = config.get('proxyHostname');
         const port = config.get('proxyPort');
 
+        if (subdivisionCodeToUse && !countryCodeToUse) {
+            throw new Error(
+                'ProxyConfiguration: "subdivisionCode" requires "countryCode" to be set.',
+            );
+        }
+
         // Validation
         if (
             (proxyUrls || newUrlFunction) &&
-            (groupsToUse.length || countryCodeToUse)
+            (groupsToUse.length || countryCodeToUse || subdivisionCodeToUse)
         ) {
             this._throwCannotCombineCustomWithApify();
         }
@@ -241,6 +278,7 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
 
         this.groups = groupsToUse;
         this.countryCode = countryCodeToUse;
+        this.subdivisionCode = subdivisionCodeToUse;
         this.password = password;
         this.hostname = hostname!;
         this.port = port;
@@ -328,7 +366,14 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
         const proxyInfo = await super.newProxyInfo(sessionId, options);
         if (!proxyInfo) return proxyInfo;
 
-        const { groups, countryCode, password, port, hostname } = (
+        const {
+            groups,
+            countryCode,
+            subdivisionCode,
+            password,
+            port,
+            hostname,
+        } = (
             this.usesApifyProxy ? this : new URL(proxyInfo.url)
         ) as ProxyConfiguration;
 
@@ -337,6 +382,7 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
             sessionId,
             groups,
             countryCode,
+            subdivisionCode,
             // this.password is not encoded, but the password from the URL will be, we need to normalize
             password: this.usesApifyProxy
                 ? (password ?? '')
@@ -413,7 +459,7 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
      */
     protected _getUsername(sessionId?: string): string {
         let username;
-        const { groups, countryCode } = this;
+        const { groups, countryCode, subdivisionCode } = this;
         const parts: string[] = [];
 
         if (groups && groups.length) {
@@ -422,7 +468,9 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
         if (sessionId) {
             parts.push(`session-${sessionId}`);
         }
-        if (countryCode) {
+        if (subdivisionCode) {
+            parts.push(`country-${countryCode}_${subdivisionCode}`);
+        } else if (countryCode) {
             parts.push(`country-${countryCode}`);
         }
 
@@ -545,7 +593,8 @@ export class ProxyConfiguration extends CoreProxyConfiguration {
         throw new Error(
             'Cannot combine custom proxies with Apify Proxy! ' +
                 'It is not allowed to set "options.proxyUrls" or "options.newUrlFunction" combined with ' +
-                '"options.groups" or "options.apifyProxyGroups" and "options.countryCode" or "options.apifyProxyCountry".',
+                '"options.groups", "options.apifyProxyGroups", "options.countryCode", "options.apifyProxyCountry", ' +
+                '"options.subdivisionCode" or "options.apifyProxySubdivision".',
         );
     }
 }
diff --git a/test/apify/proxy_configuration.test.ts b/test/apify/proxy_configuration.test.ts
index 3418699ed1..ec5a4fc5df 100644
--- a/test/apify/proxy_configuration.test.ts
+++ b/test/apify/proxy_configuration.test.ts
@@ -120,6 +120,83 @@ describe('ProxyConfiguration', () => {
         expect(proxyConfiguration.countryCode).toStrictEqual(apifyProxyCountry);
     });
 
+    test('subdivisionCode should produce country-US_XX in proxy URL', async () => {
+        const proxyConfiguration = new ProxyConfiguration({
+            groups,
+            countryCode: 'US',
+            subdivisionCode: 'CA',
+            password,
+        });
+
+        expect(await proxyConfiguration.newUrl(sessionId)).toBe(
+            'http://groups-GROUP1+GROUP2,session-538909250932,country-US_CA:test12345@proxy.apify.com:8000',
+        );
+    });
+
+    test('subdivisionCode without session should produce correct URL', async () => {
+        const proxyConfiguration = new ProxyConfiguration({
+            groups,
+            countryCode: 'US',
+            subdivisionCode: 'NY',
+            password,
+        });
+
+        expect(await proxyConfiguration.newUrl()).toBe(
+            'http://groups-GROUP1+GROUP2,country-US_NY:test12345@proxy.apify.com:8000',
+        );
+    });
+
+    test('apifyProxySubdivision UI input schema should work', async () => {
+        const proxyConfiguration = new ProxyConfiguration({
+            apifyProxyGroups: groups,
+            apifyProxyCountry: 'US',
+            apifyProxySubdivision: 'TX',
+            password,
+        });
+
+        // @ts-expect-error private property
+        expect(proxyConfiguration.subdivisionCode).toBe('TX');
+        expect(await proxyConfiguration.newUrl()).toBe(
+            'http://groups-GROUP1+GROUP2,country-US_TX:test12345@proxy.apify.com:8000',
+        );
+    });
+
+    test('subdivisionCode without countryCode should throw', () => {
+        expect(
+            () => new ProxyConfiguration({ subdivisionCode: 'CA', password }),
+        ).toThrow(
+            'ProxyConfiguration: "subdivisionCode" requires "countryCode" to be set.',
+        );
+        expect(
+            () =>
+                new ProxyConfiguration({
+                    apifyProxySubdivision: 'CA',
+                    password,
+                }),
+        ).toThrow(
+            'ProxyConfiguration: "subdivisionCode" requires "countryCode" to be set.',
+        );
+    });
+
+    test('should throw on invalid subdivisionCode', () => {
+        expect(
+            () =>
+                new ProxyConfiguration({
+                    countryCode: 'US',
+                    subdivisionCode: 'ca',
+                    password,
+                }),
+        ).toThrow();
+        expect(
+            () =>
+                new ProxyConfiguration({
+                    countryCode: 'US',
+                    subdivisionCode: 'California',
+                    password,
+                }),
+        ).toThrow();
+    });
+
     test('should throw on invalid arguments structure', () => {
         // Group value
         const invalidGroups = ['GROUP1*'];