diff --git a/.changeset/chatty-pigs-film.md b/.changeset/chatty-pigs-film.md
new file mode 100644
index 000000000000..08aabe12ba02
--- /dev/null
+++ b/.changeset/chatty-pigs-film.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/sitemap': minor
+---
+
+Ensure sitemap only excludes numerical pages matching `/404` and `/500` exactly
diff --git a/packages/integrations/sitemap/src/generate-sitemap.ts b/packages/integrations/sitemap/src/generate-sitemap.ts
index 03985f08d0e2..b10771ce481a 100644
--- a/packages/integrations/sitemap/src/generate-sitemap.ts
+++ b/packages/integrations/sitemap/src/generate-sitemap.ts
@@ -2,13 +2,11 @@ import type { EnumChangefreq } from 'sitemap';
 import type { SitemapItem, SitemapOptions } from './index.js';
 import { parseUrl } from './utils/parse-url.js';
 
-const STATUS_CODE_PAGE_REGEXP = /\/[0-9]{3}\/?$/;
-
 /** Construct sitemap.xml given a set of URLs */
 export function generateSitemap(pages: string[], finalSiteUrl: string, opts: SitemapOptions) {
 	const { changefreq, priority, lastmod: lastmodSrc, i18n } = opts!;
 	// TODO: find way to respect <link rel="canonical"> URLs here
-	const urls = [...pages].filter((url) => !STATUS_CODE_PAGE_REGEXP.test(url));
+	const urls = [...pages];
 	urls.sort((a, b) => a.localeCompare(b, 'en', { numeric: true })); // sort alphabetically so sitemap is same each time
 
 	const lastmod = lastmodSrc?.toISOString();
diff --git a/packages/integrations/sitemap/src/index.ts b/packages/integrations/sitemap/src/index.ts
index 950646247467..ffa593a92e40 100644
--- a/packages/integrations/sitemap/src/index.ts
+++ b/packages/integrations/sitemap/src/index.ts
@@ -22,24 +22,24 @@ export type LinkItem = LinkItemBase;
 
 export type SitemapOptions =
 	| {
-			filter?(page: string): boolean;
-			customPages?: string[];
-
-			i18n?: {
-				defaultLocale: string;
-				locales: Record<string, string>;
-			};
-			// number of entries per sitemap file
-			entryLimit?: number;
-
-			// sitemap specific
-			changefreq?: ChangeFreq;
-			lastmod?: Date;
-			priority?: number;
-
-			// called for each sitemap item just before to save them on disk, sync or async
-			serialize?(item: SitemapItem): SitemapItem | Promise<SitemapItem | undefined> | undefined;
-	  }
+		filter?(page: string): boolean;
+		customPages?: string[];
+
+		i18n?: {
+			defaultLocale: string;
+			locales: Record<string, string>;
+		};
+		// number of entries per sitemap file
+		entryLimit?: number;
+
+		// sitemap specific
+		changefreq?: ChangeFreq;
+		lastmod?: Date;
+		priority?: number;
+
+		// called for each sitemap item just before to save them on disk, sync or async
+		serialize?(item: SitemapItem): SitemapItem | Promise<SitemapItem | undefined> | undefined;
+	}
 	| undefined;
 
 function formatConfigErrorMessage(err: ZodError) {
@@ -49,6 +49,7 @@ function formatConfigErrorMessage(err: ZodError) {
 
 const PKG_NAME = '@astrojs/sitemap';
 const OUTFILE = 'sitemap-index.xml';
+const STATUS_CODE_PAGES = new Set(['/404', '/500']);
 
 const createPlugin = (options?: SitemapOptions): AstroIntegration => {
 	let config: AstroConfig;
@@ -85,7 +86,7 @@ const createPlugin = (options?: SitemapOptions): AstroIntegration => {
 						return;
 					}
 
-					let pageUrls = pages.map((p) => {
+					let pageUrls = pages.filter((p) => !STATUS_CODE_PAGES.has('/' + p.pathname.slice(0, -1))).map((p) => {
 						if (p.pathname !== '' && !finalSiteUrl.pathname.endsWith('/'))
 							finalSiteUrl.pathname += '/';
 						const path = finalSiteUrl.pathname + p.pathname;
@@ -97,6 +98,7 @@ const createPlugin = (options?: SitemapOptions): AstroIntegration => {
 						 * Dynamic URLs have entries with `undefined` pathnames
 						 */
 						if (r.pathname) {
+							if (STATUS_CODE_PAGES.has(r.pathname)) return urls;
 							/**
 							 * remove the initial slash from relative pathname
 							 * because `finalSiteUrl` always has trailing slash
diff --git a/packages/integrations/sitemap/test/filter.test.js b/packages/integrations/sitemap/test/filter.test.js
index 50a34007dd5d..b2623248170a 100644
--- a/packages/integrations/sitemap/test/filter.test.js
+++ b/packages/integrations/sitemap/test/filter.test.js
@@ -12,7 +12,7 @@ describe('Filter support', () => {
 				root: './fixtures/static/',
 				integrations: [
 					sitemap({
-						filter: (page) => page !== 'http://example.com/two/',
+						filter: (page) => page === 'http://example.com/one/',
 					}),
 				],
 			});
@@ -32,7 +32,7 @@ describe('Filter support', () => {
 				root: './fixtures/ssr/',
 				integrations: [
 					sitemap({
-						filter: (page) => page !== 'http://example.com/two/',
+						filter: (page) => page === 'http://example.com/one/',
 					}),
 				],
 			});
diff --git a/packages/integrations/sitemap/test/fixtures/static/src/pages/123.astro b/packages/integrations/sitemap/test/fixtures/static/src/pages/123.astro
new file mode 100644
index 000000000000..115292de96e0
--- /dev/null
+++ b/packages/integrations/sitemap/test/fixtures/static/src/pages/123.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>123</title>
+	</head>
+	<body>
+		<h1>123</h1>
+	</body>
+</html>
diff --git a/packages/integrations/sitemap/test/fixtures/static/src/pages/404.astro b/packages/integrations/sitemap/test/fixtures/static/src/pages/404.astro
new file mode 100644
index 000000000000..9e307c5c292c
--- /dev/null
+++ b/packages/integrations/sitemap/test/fixtures/static/src/pages/404.astro
@@ -0,0 +1,8 @@
+<html>
+	<head>
+		<title>404</title>
+	</head>
+	<body>
+		<h1>404</h1>
+	</body>
+</html>
diff --git a/packages/integrations/sitemap/test/staticPaths.test.js b/packages/integrations/sitemap/test/staticPaths.test.js
index bb818e7cd0fd..6fddbb193076 100644
--- a/packages/integrations/sitemap/test/staticPaths.test.js
+++ b/packages/integrations/sitemap/test/staticPaths.test.js
@@ -4,19 +4,29 @@ import { expect } from 'chai';
 describe('getStaticPaths support', () => {
 	/** @type {import('./test-utils.js').Fixture} */
 	let fixture;
+	/** @type {string[]} */
+	let urls;
 
 	before(async () => {
 		fixture = await loadFixture({
 			root: './fixtures/static/',
 		});
 		await fixture.build();
-	});
 
-	it('getStaticPath pages require zero config', async () => {
 		const data = await readXML(fixture.readFile('/sitemap-0.xml'));
-		const urls = data.urlset.url;
+		urls = data.urlset.url.map(url => url.loc[0]);
+	});
 
-		expect(urls[0].loc[0]).to.equal('http://example.com/one/');
-		expect(urls[1].loc[0]).to.equal('http://example.com/two/');
+	it('requires zero config for getStaticPaths', async () => {
+		expect(urls).to.include('http://example.com/one/');
+		expect(urls).to.include('http://example.com/two/');
 	});
+
+	it('does not include 404 pages', () => {
+		expect(urls).to.not.include('http://example.com/404/');
+	});
+
+	it('includes numerical pages', () => {
+		expect(urls).to.include('http://example.com/123/');
+	})
 });