diff --git a/src/main/java/com/example/log4u/domain/diary/facade/DiaryFacade.java b/src/main/java/com/example/log4u/domain/diary/facade/DiaryFacade.java
index 3839bcb1..558bc20b 100644
--- a/src/main/java/com/example/log4u/domain/diary/facade/DiaryFacade.java
+++ b/src/main/java/com/example/log4u/domain/diary/facade/DiaryFacade.java
@@ -57,12 +57,15 @@ public void createDiary(Long userId, DiaryRequestDto request) {
 	 * 1. diaryService: 다이어리 검증
 	 * 2. mediaService: 해당 다이어리 이미지 삭제<br>
 	 * 3. diaryService: 다이어리 삭제<br>
+	 * 4. mapService: 해당 구역 카운트 감소
 	 * */
 	@Transactional
 	public void deleteDiary(Long userId, Long diaryId) {
 		Diary diary = diaryService.getDiaryAfterValidateOwnership(diaryId, userId);
 		mediaService.deleteMediaByDiaryId(diaryId);
 		hashtagService.deleteHashtagsByDiaryId(diaryId);
+		mapService.decreaseRegionDiaryCount(diary.getLocation().getLatitude(), diary.getLocation().getLongitude());
+
 		diaryService.deleteDiary(diary);
 	}
 
@@ -72,12 +75,16 @@ public void deleteDiary(Long userId, Long diaryId) {
 	 * 1. diaryService: 다이어리 검증<br>
 	 * 2. mediaService: 해당 다이어리 이미지 삭제<br>
 	 * 3. diaryService: 다이어리 수정
+	 * 4. mapService: 해당 구역 카운트 감소
+	 * 5. mapService: 해당 구역 카운트 증가
 	 * */
 	@Transactional
 	public void updateDiary(Long userId, Long diaryId, DiaryRequestDto request) {
 		Diary diary = diaryService.getDiaryAfterValidateOwnership(diaryId, userId);
 		mediaService.updateMediaByDiaryId(diary.getDiaryId(), request.mediaList());
 		hashtagService.saveOrUpdateHashtag(diary.getDiaryId(), request.hashtagList());
+		mapService.decreaseRegionDiaryCount(diary.getLocation().getLatitude(), diary.getLocation().getLongitude());
+		mapService.increaseRegionDiaryCount(request.location().latitude(), request.location().longitude());
 
 		String newThumbnailUrl = mediaService.extractThumbnailUrl(request.mediaList());
 		diaryService.updateDiary(diary, request, newThumbnailUrl);
diff --git a/src/main/java/com/example/log4u/domain/map/entity/SidoAreasDiaryCount.java b/src/main/java/com/example/log4u/domain/map/entity/SidoAreasDiaryCount.java
index 2c078c57..8a944c6e 100644
--- a/src/main/java/com/example/log4u/domain/map/entity/SidoAreasDiaryCount.java
+++ b/src/main/java/com/example/log4u/domain/map/entity/SidoAreasDiaryCount.java
@@ -25,4 +25,8 @@ public class SidoAreasDiaryCount {
 	public void incrementCount() {
 		this.diaryCount++;
 	}
+
+	public void decrementCount() {
+		this.diaryCount = Math.max(0, this.diaryCount - 1);
+	}
 }
diff --git a/src/main/java/com/example/log4u/domain/map/entity/SiggAreasDiaryCount.java b/src/main/java/com/example/log4u/domain/map/entity/SiggAreasDiaryCount.java
index 3cab8a8f..bae8e648 100644
--- a/src/main/java/com/example/log4u/domain/map/entity/SiggAreasDiaryCount.java
+++ b/src/main/java/com/example/log4u/domain/map/entity/SiggAreasDiaryCount.java
@@ -25,7 +25,7 @@ public void incrementCount() {
 		this.diaryCount++;
 	}
 
-	public void decrement() {
+	public void decrementCount() {
 		this.diaryCount = Math.max(0, this.diaryCount - 1);
 	}
 }
diff --git a/src/main/java/com/example/log4u/domain/map/service/MapService.java b/src/main/java/com/example/log4u/domain/map/service/MapService.java
index af676c53..ac9a6682 100644
--- a/src/main/java/com/example/log4u/domain/map/service/MapService.java
+++ b/src/main/java/com/example/log4u/domain/map/service/MapService.java
@@ -60,6 +60,23 @@ public void increaseRegionDiaryCount(Double lat, Double lon) {
 			});
 	}
 
+	@Transactional
+	public void decreaseRegionDiaryCount(Double lat, Double lon) {
+		sidoAreasRepository.findRegionByLatLon(lat, lon)
+			.flatMap(sido -> sidoAreasDiaryCountRepository.findById(sido.getId()))
+			.ifPresent(count -> {
+				count.decrementCount();
+				sidoAreasDiaryCountRepository.save(count);
+			});
+
+		siggAreasRepository.findRegionByLatLon(lat, lon)
+			.flatMap(sigg -> siggAreasDiaryCountRepository.findById(sigg.getGid()))
+			.ifPresent(count -> {
+				count.decrementCount();
+				siggAreasDiaryCountRepository.save(count);
+			});
+	}
+
 	@Transactional(readOnly = true)
 	public List<DiaryMarkerResponseDto> getDiariesInBounds(double south, double north, double west, double east) {
 		return diaryRepository.findDiariesInBounds(south, north, west, east);