diff --git a/src/asserts/aba-account-number-assert.js b/src/asserts/aba-account-number-assert.js
new file mode 100644
index 0000000..59d9c58
--- /dev/null
+++ b/src/asserts/aba-account-number-assert.js
@@ -0,0 +1,43 @@
+'use strict';
+
+/**
+ * Module dependencies.
+ */
+
+const { Validator, Violation } = require('validator.js');
+
+/**
+ * Account number regex.
+ */
+
+const accountNumberRegex = /^[a-zA-Z0-9]{5,17}$/;
+
+/**
+ * Export `AbaAccountNumberAssert`.
+ */
+
+module.exports = function abaAccountNumberAssert() {
+  /**
+   * Class name.
+   */
+
+  this.__class__ = 'AbaAccountNumber';
+
+  /**
+   * Validation algorithm.
+   */
+
+  this.validate = value => {
+    if (typeof value !== 'string') {
+      throw new Violation(this, value, { value: Validator.errorCode.must_be_a_string });
+    }
+
+    if (!accountNumberRegex.test(value)) {
+      throw new Violation(this, value);
+    }
+
+    return true;
+  };
+
+  return this;
+};
diff --git a/src/index.js b/src/index.js
index 6675139..8502306 100644
--- a/src/index.js
+++ b/src/index.js
@@ -4,6 +4,7 @@
  * Module dependencies.
  */
 
+const AbaAccountNumber = require('./asserts/aba-account-number-assert');
 const AbaRoutingNumber = require('./asserts/aba-routing-number-assert.js');
 const BankIdentifierCode = require('./asserts/bank-identifier-code-assert.js');
 const BigNumber = require('./asserts/big-number-assert.js');
@@ -48,6 +49,7 @@ const Uuid = require('./asserts/uuid-assert.js');
  */
 
 module.exports = {
+  AbaAccountNumber,
   AbaRoutingNumber,
   BankIdentifierCode,
   BigNumber,
diff --git a/test/asserts/aba-account-number-assert.test.js b/test/asserts/aba-account-number-assert.test.js
new file mode 100644
index 0000000..5f9c70c
--- /dev/null
+++ b/test/asserts/aba-account-number-assert.test.js
@@ -0,0 +1,63 @@
+'use strict';
+
+/**
+ * Module dependencies.
+ */
+
+const { Assert: BaseAssert, Violation } = require('validator.js');
+const AbaAccountNumberAssert = require('../../src/asserts/aba-account-number-assert');
+
+/**
+ * Extend `Assert` with `AbaAccountNumberAssert`.
+ */
+
+const Assert = BaseAssert.extend({
+  AbaAccountNumber: AbaAccountNumberAssert
+});
+
+/**
+ * Test `AbaAccountNumberAssert`.
+ */
+
+describe('AbaAccountNumberAssert', () => {
+  it('should throw an error if the input value is not a string', () => {
+    [{}, []].forEach(choice => {
+      try {
+        Assert.abaAccountNumber().validate(choice);
+
+        fail();
+      } catch (e) {
+        expect(e).toBeInstanceOf(Violation);
+        expect(e.violation.value).toBe('must_be_a_string');
+      }
+    });
+  });
+
+  it('should throw an error if the input value is not a valid ABA account number', () => {
+    try {
+      Assert.abaAccountNumber().validate('foo');
+
+      fail();
+    } catch (e) {
+      expect(e).toBeInstanceOf(Violation);
+      expect(e.show().value).toBe('foo');
+    }
+  });
+
+  it('should expose `assert` equal to `AbaAccountNumber`', () => {
+    try {
+      Assert.abaAccountNumber().validate(123);
+
+      fail();
+    } catch (e) {
+      expect(e.show().assert).toBe('AbaAccountNumber');
+    }
+  });
+
+  it.only.each(['76175925', '76175925761759257', '76175', 'abcdefghijklmnopq', 'abcde'])(
+    'should accept a valid ABA account number',
+    accountNumber => {
+      Assert.abaAccountNumber().validate(accountNumber);
+    }
+  );
+});
diff --git a/test/asserts/aba-routing-number-assert.test.js b/test/asserts/aba-routing-number-assert.test.js
index 264eca0..f51aa3f 100644
--- a/test/asserts/aba-routing-number-assert.test.js
+++ b/test/asserts/aba-routing-number-assert.test.js
@@ -16,7 +16,7 @@ const Assert = BaseAssert.extend({
 });
 
 /**
- * Test `RoutingNumberAssert`.
+ * Test `AbaRoutingNumberAssert`.
  */
 
 describe('AbaRoutingNumberAssert', () => {
diff --git a/test/index.test.js b/test/index.test.js
index 6704d3d..dc55af5 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -14,9 +14,10 @@ describe('validator.js-asserts', () => {
   it('should export all asserts', () => {
     const assertNames = Object.keys(asserts);
 
-    expect(assertNames).toHaveLength(38);
+    expect(assertNames).toHaveLength(39);
     expect(assertNames).toEqual(
       expect.arrayContaining([
+        'AbaAccountNumber',
         'AbaRoutingNumber',
         'BankIdentifierCode',
         'BigNumber',