diff --git a/src/main/java/kccf/lcltt/service/impl/LclttServiceImpl.java b/src/main/java/kccf/lcltt/service/impl/LclttServiceImpl.java
index 6f55817..4b46c3b 100644
--- a/src/main/java/kccf/lcltt/service/impl/LclttServiceImpl.java
+++ b/src/main/java/kccf/lcltt/service/impl/LclttServiceImpl.java
@@ -30,18 +30,10 @@ public class LclttServiceImpl implements LclttService{
     
     @Override
     public int insertLcltt(LclttVO vo) {
-        String[] adresArray = vo.getAdres1().split("\\s");
-        
-        CmmDetailCodeVO cmmDetailCodeVO = new CmmDetailCodeVO();
-        cmmDetailCodeVO.setAditAtrbInfoValue1(vo.getAreaCode());
-        List<CmmDetailCodeVO> codeList = lclttDAO.selectAreaSubCodeListAjax(cmmDetailCodeVO);
-        
-        for(int i = 0; i < codeList.size(); i++) {
-            if(codeList.get(i).getDetailCodeNm().equals(adresArray[1])) {
-                vo.setAreaSubCode(codeList.get(i).getDetailCode());
-            }
+        if(vo.getAreaSubCode() == null || vo.getAreaSubCode().trim().isEmpty()) {
+            setAreaSubCodeByAdres(vo);
         }
-        
+
         return lclttDAO.insertLcltt(vo);
     }
     
@@ -52,20 +44,46 @@ public class LclttServiceImpl implements LclttService{
     
     @Override
     public int updateLcltt(LclttVO vo) {
-        
-        String[] adresArray = vo.getAdres1().split("\\s");
-        
+        if(vo.getAreaSubCode() == null || vo.getAreaSubCode().trim().isEmpty()) {
+            setAreaSubCodeByAdres(vo);
+        }
+
+        return lclttDAO.updateLcltt(vo);
+    }
+
+    /**
+     * 등록/수정 화면에서 구.군(areaSubCode)이 명시적으로 전달되지 않은 경우에 한해
+     * 주소1(adres1)의 두 번째 단어(구.군명 추정)를 AREA_SUB_CODE 목록과 매칭하여
+     * vo에 areaSubCode를 세팅하는 하위 호환용 폴백 로직이다.
+     * 예외 없이 매칭 실패 시 조용히 건너뛴다.
+     */
+    private void setAreaSubCodeByAdres(LclttVO vo) {
+        if(vo.getAdres1() == null || vo.getAdres1().trim().isEmpty()) {
+            return;
+        }
+
+        String[] adresArray = vo.getAdres1().trim().split("\\s+");
+
+        if(adresArray.length < 2) {
+            return;
+        }
+
+        String adresGuGun = adresArray[1];
+
         CmmDetailCodeVO cmmDetailCodeVO = new CmmDetailCodeVO();
         cmmDetailCodeVO.setAditAtrbInfoValue1(vo.getAreaCode());
         List<CmmDetailCodeVO> codeList = lclttDAO.selectAreaSubCodeListAjax(cmmDetailCodeVO);
-        
+
+        if(codeList == null) {
+            return;
+        }
+
         for(int i = 0; i < codeList.size(); i++) {
-            if(codeList.get(i).getDetailCodeNm().equals(adresArray[1])) {
+            if(adresGuGun.equals(codeList.get(i).getDetailCodeNm())) {
                 vo.setAreaSubCode(codeList.get(i).getDetailCode());
+                break;
             }
         }
-        
-        return lclttDAO.updateLcltt(vo);
     }
     
     @Override
diff --git a/src/main/resources/egovframework/mapper/kccf/lcltt/LclttDAO.xml b/src/main/resources/egovframework/mapper/kccf/lcltt/LclttDAO.xml
index 486281f..a3497cb 100644
--- a/src/main/resources/egovframework/mapper/kccf/lcltt/LclttDAO.xml
+++ b/src/main/resources/egovframework/mapper/kccf/lcltt/LclttDAO.xml
@@ -101,6 +101,7 @@
             A.LCLTT_ID ,
             A.LCLTT_NM ,
             A.AREA_CODE ,
+            A.AREA_SUB_CODE ,
             A.ADRES1 ,
             A.ADRES2 ,
             A.ADRES1 || ' ' || A.ADRES2 AS ADRES ,
diff --git a/src/main/webapp/WEB-INF/jsp/mng/lcltt/lclttRegist.jsp b/src/main/webapp/WEB-INF/jsp/mng/lcltt/lclttRegist.jsp
index ab3ff35..21d099b 100644
--- a/src/main/webapp/WEB-INF/jsp/mng/lcltt/lclttRegist.jsp
+++ b/src/main/webapp/WEB-INF/jsp/mng/lcltt/lclttRegist.jsp
@@ -47,6 +47,15 @@
                             </c:forEach>
                     </div>
                 </td>
+                <th>
+                    <label class="requiredText">구.군</label>
+                </th>
+                <td>
+                    <div class="row-df">
+                        <input type="hidden" id="hiddenAreaSubCode" name="hiddenAreaSubCode" value="${lclttVO.areaSubCode }" />
+                        <select class="form-control form-control-sm" id="areaSubCode" name="areaSubCode"></select>
+                    </div>
+                </td>
             </tr>
             <tr>
                 <th>
@@ -199,21 +208,53 @@
 </div>
 
 <script>
-$(document).ready(function() {    
-   
+$(document).ready(function() {
+
     if($('#hiddenUseYn').val() == $('#useYnY').val()){
         $('#useYnY').prop("checked", true);
     }else{
         $('#useYnN').prop("checked", true);
     }
-    
-    if($('#hiddenAreaCode').val() != null || $('#hiddenAreaCode').val() != ''){
+
+    if($('#hiddenAreaCode').val() != null && $('#hiddenAreaCode').val() != ''){
         $('form#insertForm select[name=areaCode]').val($('#hiddenAreaCode').val()).prop('selected', true);
     }
- 
-    
+
+    fnAreaSubCodeList($('#areaCode').val(), $('#hiddenAreaSubCode').val());
+
 });
 
+$('#areaCode').on('change', function(){
+    fnAreaSubCodeList($(this).val(), '');
+});
+
+function fnAreaSubCodeList(areaCode, selectedAreaSubCode){
+
+    $('#areaSubCode option').remove();
+
+    if(areaCode == null || areaCode == ''){
+        return;
+    }
+
+    $.ajax({
+        url: "/lcltt/selectAreaSubCodeListAjax.do",
+        type: "POST",
+        data: {"aditAtrbInfoValue1" : areaCode},
+        success: function(data){
+            $('#areaSubCode').append('<option value="">선택</option>');
+            for(var i=0; i<data.areaSubCodeList.length; i++){
+                $('#areaSubCode').append('<option value="'+ data.areaSubCodeList[i].detailCode +'">'+ data.areaSubCodeList[i].detailCodeNm +'</option>');
+            }
+            if(selectedAreaSubCode != null && selectedAreaSubCode != ''){
+                $('#areaSubCode').val(selectedAreaSubCode).prop('selected', true);
+            }
+        },
+        error: function(){
+            //전송에 실패하면 실행될 코드;
+        }
+    });
+}
+
 function fnLclttDelete(){
     var conf = confirm("정말로 삭제 하시겠습니까?");
     if(conf){               
@@ -236,7 +277,13 @@ function fnLclttSave(){
         $('#areaCode').focus();
         return false;
     }
-    
+
+    if($('#areaSubCode').val() == null || $('#areaSubCode').val() == ''){
+        alert('구.군을 선택해 주세요.');
+        $('#areaSubCode').focus();
+        return false;
+    }
+
     if($('#adres1').val() == null || $('#adres1').val() == ''){
         alert('주소를 입력해 주세요.');
         $('#adres1').focus();
@@ -279,7 +326,15 @@ function jusoCallBack(roadFullAddr,roadAddrPart1,addrDetail,roadAddrPart2,engAdd
     $('#zip').val(zipNo);
     $('#adres1').val(roadAddrPart1);
     $('#adres2').val(addrDetail+roadAddrPart2);
-    
+
+    // 주소 검색 결과의 시군구명(sggNm)과 일치하는 구.군을 자동 선택한다.
+    if(sggNm != null && sggNm != ''){
+        $('#areaSubCode option').each(function(){
+            if($(this).text() == sggNm){
+                $(this).prop('selected', true);
+            }
+        });
+    }
 }
 
 function fnList(){