diff --git a/CHANGELOG.md b/CHANGELOG.md
index c29eaf0907..aab8531b3d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ All notable changes to this project will be documented in this file. The format
 - Fixed:
 
   - optional fields not being marked as optional in frontend client (missing '?' indicator) ([#1470](https://github.com/bloom-housing/bloom/pull/1470))
+  - add duplicates to CSV export ([#1352](https://github.com/bloom-housing/bloom/issues/1352))
 
 - Changed:
   - User module has been removed and incorporated into Auth module
diff --git a/backend/core/src/applications/applications.controller.ts b/backend/core/src/applications/applications.controller.ts
index 251b1f231d..44f8dabe65 100644
--- a/backend/core/src/applications/applications.controller.ts
+++ b/backend/core/src/applications/applications.controller.ts
@@ -203,7 +203,7 @@ export class ApplicationsController {
   @ApiOperation({ summary: "List applications as csv", operationId: "listAsCsv" })
   @Header("Content-Type", "text/csv")
   async listAsCsv(@Query() queryParams: ApplicationsCsvListQueryParams): Promise<string> {
-    const applications = await this.applicationsService.list(queryParams)
+    const applications = await this.applicationsService.listWithFlagged(queryParams)
     const listing = await this.listingsService.findOne(queryParams.listingId)
     return this.applicationCsvExporter.export(
       applications,
diff --git a/backend/core/src/applications/applications.service.ts b/backend/core/src/applications/applications.service.ts
index 37cf78de2e..e9b4a03688 100644
--- a/backend/core/src/applications/applications.service.ts
+++ b/backend/core/src/applications/applications.service.ts
@@ -43,6 +43,39 @@ export class ApplicationsService {
     return result
   }
 
+  public async listWithFlagged(params: PaginatedApplicationListQueryParams) {
+    const qb = this._getQb(params)
+    const result = await qb.getMany()
+
+    // Get flagged applications
+    const flaggedQuery = await this.repository
+      .createQueryBuilder("applications")
+      .leftJoin(
+        "application_flagged_set_applications_applications",
+        "application_flagged_set_applications_applications",
+        "application_flagged_set_applications_applications.applications_id = applications.id"
+      )
+      .andWhere("applications.listing_id = :lid", { lid: params.listingId })
+      .select(
+        "applications.id, count(application_flagged_set_applications_applications.applications_id) > 0 as flagged"
+      )
+      .groupBy("applications.id")
+      .getRawAndEntities()
+
+    // Reorganize flagged to object to make it faster to map
+    const flagged = flaggedQuery.raw.reduce((obj, application) => {
+      return { ...obj, [application.id]: application.flagged }
+    }, {})
+    await Promise.all(
+      result.map(async (application) => {
+        // Because TypeOrm can't map extra flagged field we need to map it manually
+        application.flagged = flagged[application.id]
+        await this.authorizeUserAction(this.req.user, application, authzActions.read)
+      })
+    )
+    return result
+  }
+
   async listPaginated(
     params: PaginatedApplicationListQueryParams
   ): Promise<Pagination<Application>> {
diff --git a/backend/core/src/applications/dto/application.dto.ts b/backend/core/src/applications/dto/application.dto.ts
index 6d677b3c8b..41c51b2aaa 100644
--- a/backend/core/src/applications/dto/application.dto.ts
+++ b/backend/core/src/applications/dto/application.dto.ts
@@ -43,6 +43,7 @@ export class ApplicationDto extends OmitType(Application, [
   "accessibility",
   "demographics",
   "householdMembers",
+  "flagged",
 ] as const) {
   @Expose()
   @ValidateNested({ groups: [ValidationsGroupsEnum.default] })
diff --git a/backend/core/src/applications/entities/application.entity.ts b/backend/core/src/applications/entities/application.entity.ts
index 94e322e77f..3c78ba1962 100644
--- a/backend/core/src/applications/entities/application.entity.ts
+++ b/backend/core/src/applications/entities/application.entity.ts
@@ -242,4 +242,10 @@ export class Application extends AbstractEntity {
   @Expose()
   @IsBoolean({ groups: [ValidationsGroupsEnum.default] })
   markedAsDuplicate: boolean
+
+  // This is a 'virtual field' needed for CSV export
+  @Expose()
+  @IsBoolean({ groups: [ValidationsGroupsEnum.default] })
+  @IsOptional({ groups: [ValidationsGroupsEnum.partners] })
+  flagged?: boolean
 }
diff --git a/backend/core/src/csv/formatting/formatters.ts b/backend/core/src/csv/formatting/formatters.ts
index a5349aef22..a8de5e0fb9 100644
--- a/backend/core/src/csv/formatting/formatters.ts
+++ b/backend/core/src/csv/formatting/formatters.ts
@@ -608,3 +608,19 @@ export const formatHOPWAPreference = {
     )
   },
 }
+
+export const formatMarkedAsDuplicate = {
+  label: "Marked as duplicate",
+  discriminator: "",
+  formatter: (application: Application) => {
+    return booleanFormatter(application.markedAsDuplicate)
+  },
+}
+
+export const formatFlagged = {
+  label: "Flagged",
+  discriminator: "",
+  formatter: (application: Application) => {
+    return booleanFormatter(application.flagged)
+  },
+}
diff --git a/backend/core/src/csv/formatting/metadata/basic-formatting-metadata.ts b/backend/core/src/csv/formatting/metadata/basic-formatting-metadata.ts
index ef6bc495b5..761aef8e07 100644
--- a/backend/core/src/csv/formatting/metadata/basic-formatting-metadata.ts
+++ b/backend/core/src/csv/formatting/metadata/basic-formatting-metadata.ts
@@ -44,6 +44,8 @@ import {
   formatRequestUnitType,
   formatVouchersOrSubsidies,
   formatWorkPreference,
+  formatMarkedAsDuplicate,
+  formatFlagged,
 } from "../formatters"
 
 export const basicFormattingMetadata = [
@@ -92,4 +94,6 @@ export const basicFormattingMetadata = [
   formatWorkPreference,
   formatHouseholdSize,
   formatHoueholdMembers,
+  formatMarkedAsDuplicate,
+  formatFlagged,
 ]
diff --git a/backend/core/test/applications/applications.e2e-spec.ts b/backend/core/test/applications/applications.e2e-spec.ts
index f0898b166d..02608ed55f 100644
--- a/backend/core/test/applications/applications.e2e-spec.ts
+++ b/backend/core/test/applications/applications.e2e-spec.ts
@@ -416,7 +416,8 @@ describe("Applications", () => {
       .get(`/applications/csv/?includeHeaders=true&listingId=${listing1Id}`)
       .set(...setAuthorization(adminAccessToken))
       .expect(200)
-    expect(typeof res.body === "string")
+    expect(typeof res.text === "string")
+    expect(new RegExp(/Flagged/).test(res.text)).toEqual(true)
   })
 
   it(`should allow an admin to delete user's applications`, async () => {