diff --git a/server.js b/server.js
index fdb4945..627a3a6 100644
--- a/server.js
+++ b/server.js
@@ -1055,4 +1055,35 @@ app.post('/api/isCountry', async (req, res) => {
   }
 });
 
+/**
+ * POST /api/isValidStateCode
+ * @summary Returns true if valid US state code, otherwise false 
+ * @param {BasicRequest} request.body.required - The state code to validate
+ * @return {BasicResponse} 200 - Success response
+ * @return {BadRequestResponse} 400 - Bad request response
+ * @example request - test
+ * {
+ *   "inputString": "LA"
+ * }
+ * @example response - 200 - example payload
+ * {
+ *   "result": true
+ * }
+ * @example response - 400 - example
+ * {
+ *   "error": "Input string required as a parameter."
+ * }
+ */
+app.post('/api/isValidStateCode', (req, res) => {
+  const { inputString } = req.body;
+
+  if (!inputString) {
+    return res.status(400).json({ error: requiredParameterResponse });
+  }
+
+  const result = ValidationFunctions.isValidStateCode(inputString);
+
+  res.json({ result });
+});
+
 module.exports = app;
diff --git a/test/integration/isValidStateCode.test.js b/test/integration/isValidStateCode.test.js
new file mode 100644
index 0000000..5574411
--- /dev/null
+++ b/test/integration/isValidStateCode.test.js
@@ -0,0 +1,32 @@
+const request = require('supertest');
+const app = require('../../server.js');
+
+describe('POST /api/isValidStateCode', () => {
+  it('should return true for a valid US state code', async () => {
+    const response = await request(app)
+      .post('/api/isValidStateCode')
+      .send({ inputString: 'LA' })
+      .expect(200);
+
+    expect(response.body).toHaveProperty('result', true);
+  });
+
+  it('should return false for an invalid US state code', async () => {
+    const response = await request(app)
+      .post('/api/isValidStateCode')
+      .send({ inputString: 'LAX' })
+      .expect(200);
+
+    expect(response.body).toHaveProperty('result', false);
+  });
+
+  it('should return 400 if inputString is missing', async () => {
+    const response = await request(app)
+      .post('/api/isValidStateCode')
+      .send({})
+      .expect(400);
+
+    expect(response.body).toHaveProperty('error');
+    expect(response.body.error).toBeDefined();
+  });
+});
diff --git a/test/unit/isValidStateCode.test.js b/test/unit/isValidStateCode.test.js
new file mode 100644
index 0000000..79db67f
--- /dev/null
+++ b/test/unit/isValidStateCode.test.js
@@ -0,0 +1,21 @@
+const { isValidStateCode } = require('../../validationFunctions');
+
+describe('isValidStateCode', () => {
+  it('should return true for valid US state codes', () => {
+    // Valid US state codes
+    expect(isValidStateCode('LA')).toBe(true);
+    expect(isValidStateCode('NY')).toBe(true);
+    expect(isValidStateCode('FL')).toBe(true);
+  });
+
+  it('should return false for invalid US state codes', () => {
+    // Invalid US state codes
+    expect(isValidStateCode('LAX')).toBe(false);
+    expect(isValidStateCode('NY1')).toBe(false);
+    expect(isValidStateCode('FL?')).toBe(false);
+  });
+
+  it('should return false for empty strings', () => {
+    expect(isValidStateCode('')).toBe(false);
+  });
+});
diff --git a/validationFunctions.js b/validationFunctions.js
index 0876a3b..2e1f577 100644
--- a/validationFunctions.js
+++ b/validationFunctions.js
@@ -432,6 +432,24 @@ module.exports = class ValidationFunctions {
       throw new Error(error_details);
     }
   }
+
+  /**
+   * Checks if the provided string is a valid US state code.
+   * 
+   * @param {string} inputString - The state code to validate.
+   * @return {boolean} - Returns `true` if `inputString` is a valid US state code, otherwise `false`.
+   */
+  static isValidStateCode(inputString) {
+    const validStateCodes = [
+      "AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA", 
+      "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD", 
+      "MA", "MI", "MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ", 
+      "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC", 
+      "SD", "TN", "TX", "UT", "VT", "VA", "WA", "WV", "WI", "WY"
+    ];
+
+    return validStateCodes.includes(inputString);
+  }
 }
 
 const handleAxiosError = (error) => {
diff --git a/views/pages/index.pug b/views/pages/index.pug
index 2b36629..264175f 100644
--- a/views/pages/index.pug
+++ b/views/pages/index.pug
@@ -29,6 +29,7 @@ block content
         option(value='isBinaryString') Is Binary String
         option(value='isBoolean') Is Boolean
         option(value='isCountry') Is Country
+        option(value='isValidStateCode') Is Valid State Code
 
     br
     br